The fulcrum is in the center and equidistant from both ends of the seesaw.
To find the location of the fulcrum when the seesaw is balanced, we need to consider the torques acting on the seesaw.
The torque (τ) of an object is given by the equation:
τ = F * r * sin(θ)
where F is the force applied, r is the distance from the pivot point (fulcrum), and θ is the angle between the force vector and the lever arm.
In this case, the torque due to the weight on one side of the seesaw should be equal to the torque due to the weight on the other side when the seesaw is balanced.
Let's calculate the torques for each side of the seesaw:
Torque on the left side:
τ_left = (30 kg * 9.8 m/s²) * 1.5 ft = 441 ft·kg
Torque on the right side:
τ_right = (30 kg * 9.8 m/s²) * 1.5 ft = 441 ft·kg
Since the torques on both sides are equal, the fulcrum must be located at the center of the seesaw.
Therefore, the fulcrum is in the center and equidistant from both ends of the seesaw.
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Four 30 kg children are balancing on a 50 kg seesaw, each 1.5 feet from each other and the ends of the seesaw. When the seesaw is balanced, the fulcrum will be at the Center of Mass. Where is the fulcrum when it is balanced?
Round to three decimal places as needed.) c. Find the probability that a randomly selected voter voted for someone other than Candidate 4. The probability that a randomly selected voter voted for someone other than Candidate 4 is (Type an integer or a decimal. Round to three decimal places as needed.) A frequency distribution for an election in a certain country is given in the accompanying table. Complete parts (a) through (c) below. a. Find the probability that a randomiy selected voter voted for Candidate 4. The probability that a randomly selected voter voted for Candidate 4 is 0.053. (Type an integer or a decimal. Round to three decimal places as needed.) b. Find the probability that a randomly selected voter voted for either Candidate 1 or Candidate 5. The probability that a randomly selected voter voled for either Candidate 1 or Candidate 5 is
(a) The probability that a randomly selected voter voted for Candidate 4 is 0.053.
(b) To find the probability that a randomly selected voter voted for either Candidate 1 or Candidate 5, we need to sum the individual probabilities of voting for each candidate.
Candidate 1: 0.102
Candidate 5: 0.084
Adding these probabilities gives:
0.102 + 0.084 = 0.186
Therefore, the probability that a randomly selected voter voted for either Candidate 1 or Candidate 5 is 0.186.
The probability of a randomly selected voter voting for Candidate 4 is given in the problem as 0.053. This means that out of all the voters, approximately 5.3% voted for Candidate 4.
To find the probability of a randomly selected voter voting for either Candidate 1 or Candidate 5, we sum the individual probabilities of each candidate. The probability of voting for Candidate 1 is given as 0.102, which means approximately 10.2% of voters chose Candidate 1. Similarly, the probability of voting for Candidate 5 is given as 0.084, representing approximately 8.4% of voters. Adding these probabilities together gives the combined probability of 0.186 or 18.6%.
By understanding the given frequency distribution and the probabilities associated with each candidate, we can calculate the probabilities of different voting outcomes. These probabilities provide insight into the voting patterns of the population and can help analyze and understand the election results.
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For an actual shaft and an actual hole in a transition fit phi
50 H8/p7, the actual fit formed by the actual shaft and the actual
hole is an interference fit or a clearance fit. Please give the
reason
To determine whether the actual fit is an interference fit or a clearance fit, you need to measure the actual sizes of the shaft and hole and compare them to the tolerance limits specified by the H8 and p7 designations.
In a transition fit, such as φ50 H8/p7, the fit allows for both interference and clearance depending on the actual sizes of the shaft and hole.
To determine whether the actual fit formed by the actual shaft and hole is an interference fit or a clearance fit, we need to compare the actual sizes of the shaft and hole with the tolerance limits specified by the H8 and p7 designations.
In this case, the H8 tolerance for the hole indicates a basic hole size with a relatively tight tolerance, while the p7 tolerance for the shaft indicates a basic shaft size with a looser tolerance. The "φ50" specification specifies the nominal size of the fit as 50 mm.
If the actual shaft size falls within the upper limit of the p7 tolerance and the actual hole size falls within the lower limit of the H8 tolerance, the fit will be a clearance fit. This means that there will be a gap or clearance between the shaft and the hole, allowing for easy assembly and potential movement or play between the parts.
On the other hand, if the actual shaft size falls within the lower limit of the p7 tolerance and the actual hole size falls within the upper limit of the H8 tolerance, the fit will be an interference fit. This means that the shaft will be larger than the hole, resulting in a tight fit where the parts are pressed or forced together. This can create friction and require more force for assembly.
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Topic 3: Numerical Descriptive Statistics 18. In your own words, thoroughly describe the difference between the mean and median. 19. Explain in your own words what is measured by the standard deviation. 20. Suppose we have data on the ages of U.S. presidents. We also have ages for a sample of high school teachers. Which group would you expect the have a larger standard deviation and why?
The mean is influenced by the values, while the median focuses on the position of values. The variability in ages among U.S. presidents is expected to be larger, resulting in a larger standard deviation.
The mean and median are both measures of central tendency, but they differ in how they represent the center of a data set. The mean, also known as the average, is calculated by adding up all the values in a data set and dividing it by the total number of values.
It is highly influenced by extreme values or outliers since it takes into account the magnitude of all the values. The mean provides a balanced representation of the entire data set.
On the other hand, the median is the middle value in an ordered data set. To find the median, the data set is first arranged in ascending or descending order, and then the middle value is identified. If there is an even number of values, the median is the average of the two middle values. The median is less affected by extreme values because it only considers the relative position of the values rather than their actual values.
The standard deviation measures the dispersion or spread of data around the mean. It quantifies the average amount by which each data point in a set deviates from the mean. In other words, it tells us how much the data points are scattered or spread out from the average.
A larger standard deviation indicates a greater dispersion of data points from the mean. If we compare the ages of U.S. presidents and high school teachers, we would expect the standard deviation of the U.S. presidents' ages to be larger. This is because the age range for U.S. presidents is much broader, spanning from early 40s to late 70s or even older.
On the other hand, the age range for high school teachers would likely be narrower, with most teachers falling within a certain age range, such as 25 to 65.
Therefore, the variability in ages among U.S. presidents is expected to be larger, resulting in a larger standard deviation.
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A customer has $599 to spend on a stereo system and some compact discs. If he buys a stereo that costs $358 and the discs cost $24 each, then find the greatest number of discs that he can buy. Round your answer to whole number.
The customer can buy a maximum of 10 compact discs with the given budget of $599, considering the cost of the stereo system is $358 and each disc costs $24.
To find the greatest number of compact discs that the customer can buy, we need to subtract the cost of the stereo system from the total amount the customer has and then divide the remaining amount by the cost of each disc.
The total amount the customer has: $599
Cost of the stereo system: $358
Cost of each compact disc: $24
Calculating the remaining amount after buying the stereo system:
Remaining amount = Total amount - Cost of stereo system = $599 - $358 = $241
Dividing the remaining amount by the cost of each compact disc:
Number of discs = Remaining amount / Cost of each disc = $241 / $24 = 10.0416
Since the customer cannot buy a fraction of a compact disc, we round down to the nearest whole number.
Therefore, the greatest number of discs the customer can buy is 10.
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Consider the following data set: Below is a partially completed stem-and-leaf diagram for this data set: 47,49,36,61,63,49,20,53,46,58,30,25,61,23,35,20,35 Determine the correct values for the missing entries, and fill them in.
The missing entries for the stem-and-leaf diagram are 2, 3, 5, and 9. To fill in the missing entries in the stem-and-leaf diagram, we need to examine the given data set and determine the appropriate values for each stem.
Looking at the given data set, we can identify the stems as the tens digit of each number. The leafs are the ones digit. Based on the given data, we can complete the stem-and-leaf diagram as follows:
Stem | Leaves
----------------
2 | 0, 3, 5
3 | 0, 5, 6
4 | 6, 7, 9
5 | 3, 8
6 | 1, 3
By examining the original data set, we can determine the correct values for the missing entries. In this case, the missing entries are 20, 23, 25, 30, 35, 36, 46, 47, 49, 53, 58, 61, and 63. These values are inserted into the respective stems in the stem-and-leaf diagram to complete it.
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Consider two statistically independent, zero-mean random processes X(t) and Y(t) with respective autocorrelation functions
R XX(t1,t 2)=e −∣τ∣R YY(t1,t 2)=cos(2πτ) (a) Find the autocorrelation of the sum W(t)=X(t)+Y(t). (b) Find the autocorrelation of the difference Z(t)=X(t)−Y(t). (c) Find the cross-correlation of W(t) and Z(t). (d) Are the random processes W(t) and Z(t) uncorrelated?
The autocorrelation of the given sum is RWW(t1, t2) = RXX(t1, t2) + RYY(t1, t2) + 2 * RXYP(t1, t2). The autocorrelation of the given difference is RZZ(t1, t2) = RXX(t1, t2) + RYY(t1, t2) - 2 * RXYP(t1, t2). The cross-correlation is RWZ(t1, t2) = RXX(t1, t2) - RYY(t1, t2). The random processes are correlated.
(a) To find the autocorrelation of the sum W(t) = X(t) + Y(t), we add the autocorrelation functions of X(t) and Y(t) and also consider the cross-correlation between X(t) and Y(t) using the formula RWW(t1, t2) = RXX(t1, t2) + RYY(t1, t2) + 2 * RXYP(t1, t2), where RXYP(t1, t2) is the cross-correlation between X(t) and Y(t).
(b) To find the autocorrelation of the difference Z(t) = X(t) - Y(t), we subtract the autocorrelation functions of X(t) and Y(t) and consider the cross-correlation between X(t) and Y(t) using the formula RZZ(t1, t2) = RXX(t1, t2) + RYY(t1, t2) - 2 * RXYP(t1, t2).
(c) The cross-correlation of W(t) and Z(t) is given by RWZ(t1, t2) = RXX(t1, t2) - RYY(t1, t2). It is obtained by subtracting the autocorrelation functions of Y(t) from X(t).
(d) Since the cross-correlation between W(t) and Z(t) is non-zero, it indicates that there is a correlation between the random processes W(t) and Z(t). They are not uncorrelated.
In summary, the autocorrelation of the sum W(t) is the sum of the autocorrelation functions of X(t) and Y(t) plus twice the cross-correlation between X(t) and Y(t). The autocorrelation of the difference Z(t) is the sum of the autocorrelation functions of X(t) and Y(t) minus twice the cross-correlation between X(t) and Y(t). The cross-correlation between W(t) and Z(t) is the difference between the autocorrelation functions of X(t) and Y(t). These results indicate that the random processes W(t) and Z(t) are correlated.
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A box-shaped barge of 80 metres length and 8 metres breadth is floating at an even keel draft of 2.8 metres. Her KG is 2.5 metres. Calculate the righting moment if she is heeled to an angle of 3°.
The righting moment of the box-shaped barge is 14,515.2 Nm if she is heeled to an angle of 3°.
A box-shaped barge of 80 meters length and 8 meters breadth is floating at an even keel draft of 2.8 meters.
Her KG is 2.5 meters.
To calculate the righting moment if she is heeled to an angle of 3°, use the formula: RM = GZ x Displacement
Where, GZ = GM sin(θ)Displacement = Volume of water displaced × Density of water. Given, Length (l) = 80 meters
Breadth (b) = 8 meters, Draft (T) = 2.8 meters, KG = 2.5 meters, Angle of heel (θ) = 3°
Depth of the center of gravity (G) = T - KG = 2.8 - 2.5 = 0.3 meters.
The new center of buoyancy (B') moves to the new center of gravity (G').
GZ = GM sin(θ)= (BM - BG) sin(θ) = KB sin(θ)= T / 2 sin(θ) = 2.8 / 2 × sin 3°= 0.0756 meters
Displacement (D) = Volume of water displaced × Density of water= lb × bw × d × ρ= 80 × 8 × 0.3 × 1000= 192,000 kg
RM = GZ × Displacement= 0.0756 × 192,000= 14,515.2 Nm
Therefore, the righting moment of the box-shaped barge is 14,515.2 Nm if she is heeled to an angle of 3°.
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Find the sequence of pseudorandom numbers generated by the linear congruential method using the modulus m = 11, multiplier = 5, increment c = 6 and seed x0 = 2. Stop when the sequence returns back to the original seed.
The sequence of pseudorandom numbers generated by the linear congruential method with the given parameters is: 2, 5, 9, 7, 8, 2.
To generate the sequence of pseudorandom numbers using the linear congruential method, we can use the following recursive formula:
Xn+1 = (a*Xn + c) mod m
Given the modulus m = 11, multiplier a = 5, increment c = 6, and seed x0 = 2, we can calculate the sequence as follows:
X1 = (52 + 6) mod 11 = 16 mod 11 = 5
X2 = (55 + 6) mod 11 = 31 mod 11 = 9
X3 = (59 + 6) mod 11 = 51 mod 11 = 7
X4 = (57 + 6) mod 11 = 41 mod 11 = 8
X5 = (5*8 + 6) mod 11 = 46 mod 11 = 2
At this point, we have returned back to the original seed x0 = 2, indicating the end of the sequence.
Therefore, the sequence of pseudorandom numbers generated by the linear congruential method with the given parameters is: 2, 5, 9, 7, 8, 2.
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1.) Write the first five terms of the recursive sequence. \quad a_{1}=5, a_{n+1}=a_{n}-7
Thus, the first five terms of the recursive sequence are 5, -2, -9, -16, -23.
Given that the first term of the recursive sequence is[tex]$a_{1}=5$[/tex]and the nth term is obtained by subtracting 7 from the previous term. Therefore, the second term will be[tex]$a_2 = a_1 - 7$[/tex]
So we have [tex]$a_2 = 5 - 7 = -2$.\\The third term will be $a_3 = a_2 - 7$. \\So we have $a_3 = -2 - 7 = -9$.\\The fourth term will be $a_4 = a_3 - 7$. \\So we have $a_4 = -9 - 7 = -16$.\\The fifth term will be $a_5 = a_4 - 7$.\\ So we have $a_5 = -16 - 7 = -23$[/tex].
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you purchased 4.2 kg of apples from the store.you noticed that they used a spring scale with the smallest division of 10.5g to weigh them. what is the relative error in this wieght measurement as a percentage? ( for example,if you find it to be 1.2% you should enter 1.2 in the answer box.)
Given that,
Weight of apples = 4.2 kg or 4200 g
The smallest division of spring scale = 10.5 g
Let’s calculate the absolute error.
Absolute error = (smallest division of scale)/2
= (10.5 g)/2
= 5.25 g
Now, let’s calculate the relative error.
Relative error = (Absolute error/Measured quantity) × 100%
=(5.25 g/4200 g) × 100%
= 0.125%
Therefore, the relative error in this weight measurement is 0.125%.
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Consider a consumer with the following utility function for goods x and y :
U(x,y)=(A+Bxᵅyᵝ)ᶜ
The prices of each good are px=7.2 and py=2.7, respectively, and the consumer's income is m=698 Assume the following parameter values: α=0.49, β=0.23,A=3.3,B=10.2, and C=16.9. The government introduces a tax of 60.7% on the price of good y.
Question: What is the change in the consumer's optimal consumption of good y after the introduction of the tax?
That is, let y∗ be the optimal consumption of good y before the tax is introduced, and y∗∗ after the tax is introduced.
The change in the consumer's consumption of good y is:
Δy=y∗∗−y∗.
Δy=y∗∗−y∗.
The question is asking you to calculate Δy.
______________________________
Note: write your answer with four decimal points, and don't forget to add a "-" sign if it is negative.
Don't forget to double-check your answer before submitting it. You only have one try.
The change is negative, indicating a reduction in the consumer's consumption of good y after the introduction of the tax. Therefore, the answer is -9.7140.
The optimal consumption of good y before the introduction of tax (y*) is obtained by maximizing the utility function under the budget constraint, i.e., pxx+pyy=m. Thus, the problem is: max(A+Bxᵅyᵝ)ᶜ st pxx+pyy=m.
The Lagrangian is: L=(A+Bxᵅyᵝ)ᶜ+λ(m−pxx−pyy),
The FOCs are:
∂L/∂x=0
=CB(A+Bxᵅyᵝ)ᶜ−λpx∂L/∂y=0
=CB(A+Bxᵅyᵝ)ᶜ−λpypxx+pyy=m.
We can solve for x and y to obtain:
x=(Bpy)^(−1/α)∗((CB(m/px))^(1/α))
y=((Bpx)^(−1/β)∗((CB(m/py))^(1/β)), respectively.
Using the parameter values given in the question, we get: x=7.7088 and y=22.4589, which is the optimal consumption of good y before the tax is introduced. After the tax is introduced, the budget constraint becomes: pxx+(1+τ)pyy=m, where τ is the ad valorem tax rate, i.e., τ=0.607.
Using the same method as above, the optimal consumption of good y after the tax is introduced (y**) is:
y**=((Bpx)^(−1/β)∗((CB(m/(1+τ)py))^(1/β)), which gives us y**=12.7449.
Thus, the change in the consumer's consumption of good y is:
Δy=y**−y*
=12.7449−22.4589
=−9.7140.
Note that the change is negative, indicating a reduction in the consumer's consumption of good y after the introduction of the tax. Therefore, the answer is -9.7140.
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Determine the area enclosed by the lines x=4y-(y^2) and x= 0
The area enclosed by the lines [tex]x=4y-(y^2) and x=0[/tex] is 8 square units.
To calculate the area enclosed by the lines[tex]x=4y-(y^2) and x=0[/tex], we first need to find the points of intersection between these two curves.
Setting the equations equal to each other, we have:
[tex]4y-(y^2) = 0[/tex]
Rearranging the equation, we get:
[tex]y^2 - 4y = 0[/tex]
Factoring out y, we have:
[tex]y(y - 4) = 0[/tex]
So, the two y-values where the curves intersect are [tex]y = 0[/tex] and [tex]y = 4[/tex]. Substituting these y-values back into either of the equations, we can find the corresponding x-values: For [tex]y = 0: x = 4(0) - (0^2) = 0[/tex]
For[tex]y = 4: x = 4(4) - (4^2) = 0[/tex] Now, we can calculate the area between the curves by integrating the equation [tex]x = 4y - (y^2) from y = 0 to y = 4[/tex]:
Area = [tex]∫[0,4] (4y - (y^2)) dy[/tex]
Evaluating the integral, we get: Area = 8 square units
Therefore, the area enclosed by the lines [tex]x=4y-(y^2) and x=0[/tex] is 8 square units.
[tex]y(y - 4) = 0[/tex]
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In 1967, the New Zealander Burt Munro set the world speed record for an Indtan motorcycle, on the Bonneville Salt Flats in Utah, reaching 183.58mi/h. The one-Way course was 5.00mi long. Acceleration rates are often described by the time it takes to reach 600mi h from rest D Assuming that time was 4.4 s for Burt, if he accelerated at a constant rate until he reached lis maximum speed, and then coatinued at that speed until the end of the course, how long, in seconds, did it take him to complete the course?
To calculate the time it took for Burt Munro to complete the course, determine the acceleration rate during the acceleration phase and calculate the distance traveled during each phase. Add the time taken during both phases to get the total time.
To calculate the time it took for Burt Munro to complete the course, we need to consider two phases: the acceleration phase and the constant speed phase.
1. Acceleration Phase:
Given that Burt Munro accelerated from rest to his maximum speed of 183.58 mi/h (or 600 mi/h) in 4.4 seconds, we can determine his acceleration rate during this phase.
Using the equation for constant acceleration, where final velocity (vf) equals initial velocity (vi) plus acceleration (a) multiplied by time (t), we can calculate the acceleration rate:
vf = vi + at
Rearranging the equation to solve for acceleration (a), we have:
a = (vf - vi) / t
Plugging in the values, where vi is 0 (since Burt started from rest), vf is 600 mi/h, and t is 4.4 seconds, we can find the acceleration rate.
2. Constant Speed Phase:
Once Burt reaches his maximum speed of 183.58 mi/h, he continues at that speed for the remaining distance of the course. Since he is traveling at a constant speed, we do not need to consider acceleration during this phase.
Now, let's calculate the time it takes for Burt to complete the course.
Distance traveled during the acceleration phase:
Using the equation d = vit + (1/2)at^2, where vi is the initial velocity, t is the time, and a is the acceleration, we can find the distance traveled during the acceleration phase.
Distance traveled during the constant speed phase:
Since Burt maintains a constant speed until the end of the course, we can calculate the distance traveled during this phase using the formula d = vt, where v is the constant velocity and t is the time.
Total time to complete the course:
Add the time taken during the acceleration phase to the time taken during the constant speed phase to get the total time to complete the course.
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A regression equation is y=15+20x.is y=15+20x.
(a) What is the slope of the regression line?
Give your answer as an exact number.
slope:
A regression equation is y=15+20x.is y=15+20x. The slope of the regression line in the equation y = 15 + 20x is 20.
In the equation y = 15 + 20x, the coefficient of x represents the slope of the regression line. In this case, the coefficient of x is 20, which indicates that for every unit increase in x, the corresponding value of y will increase by 20 units. Therefore, the slope of the regression line is 20.
The slope represents the rate of change of the dependent variable (y) with respect to the independent variable (x) in a linear regression model. A positive slope indicates a positive relationship between the variables, where an increase in x is associated with an increase in y. In this case, the slope of 20 suggests that as x increases, y will increase by 20 units, resulting in a positive linear relationship between the variables.
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The demand for a certain portable USB battery charger is given by D(p)=−5p^2+4p+4, where p represents the price in dollars
(a) Find the rate of change of demand with respect to price
(b) Find and interpret the rate of change of demand when the price is $13.
(a) The rate of change of demand with respect to price is ___
(b) Select the correct choice below and fill in the answer box to complete your choice.
A. Demand is increasing at a rate of 1 item per $____increase in price.
B. Demand is decreasing at a rate of ____items per $ 1 increase in price.
C. Demand is increasing at a rate of _____ items per $1 increase in price.
D. Demand is decreasing at a rate of 1 item per $____ decrease in price.
(a) To find the rate of change of demand with respect to price, we differentiate the demand function D(p) with respect to p:
D'(p) = -10p + 4
Therefore, the rate of change of demand with respect to price is -10p + 4.
(b) To find the rate of change of demand when the price is $13, we substitute p = 13 into the derivative D'(p):
D'(13) = -10(13) + 4 = -130 + 4 = -126
The rate of change of demand when the price is $13 is -126.
Now, let's interpret the rate of change of demand:
The negative value (-126) indicates that the demand is decreasing. However, we need to determine the relationship between the rate of change and the price increase.
Since the question asks for the rate of change per $1 increase in price, we divide the rate of change (-126) by 1:
-126 items / $1 increase in price
Therefore, the correct choice is:
B. Demand is decreasing at a rate of 126 items per $1 increase in price.
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If Shoppers Enter A Mall At Rate Of 15 Per Hour, What Is Probability Of Each Of The Following?1) Exactly 6 Customers Enter Mall In 1h Period2) 0 Customers Enter Mall In 20-Minute Period3) 1 Customer Enter Mall In 20-Minute Period4) At Least 2 Customers Will Enter Mall In 20-Minute Period5) At Most, 1 Customer Will Enter Mall In
If shoppers enter a mall at rate of 15 per hour, what is probability of each of the following?
1) Exactly 6 customers enter mall in 1h period
2) 0 customers enter mall in 20-minute period
3) 1 customer enter mall in 20-minute period
4) At least 2 customers will enter mall in 20-minute period
5) At most, 1 customer will enter mall in 20-minute period
The probability of exactly 6 customers entering the mall in a 1-hour period is 0.0127 (approx). The probability of 0 customers entering the mall in a 20-minute period is 0.0067 (approx).
Given data: shoppers enter a mall at the rate of 15 per hour. We need to find the probabilities of different events. Explanation: Exactly 6 customers enter mall in a 1-hour period
P(X = 6) = (e^-15 * 15^6) / 6! = 0.0127 (approx)
Therefore, the probability of exactly 6 customers entering the mall in a 1-hour period is 0.0127 (approx).
0 customers enter the mall in a 20-minute period. Here, the time is given in minutes and the rate is given in an hour. Hence, we need to first convert the rate into a 20-minute period. So, the rate of customers entering the mall in 20 minutes = 15/3 = 5.Now,
P(X = 0) = e^-5 = 0.0067 (approx)
Therefore, the probability of 0 customers entering the mall in a 20-minute period is 0.0067 (approx).
1 customer enters the mall in a 20-minute period. The rate of customers entering the mall in 20 minutes is already calculated as 5.
P(X = 1) = (e^-5 * 5^1) / 1! = 0.0337 (approx)
Therefore, the probability of 1 customer entering the mall in a 20-minute period is 0.0337 (approx).
At least 2 customers will enter the mall in a 20-minute period. Here, we need to find the probability of 2 or more customers entering the mall in 20 minutes.
P(X ≥ 2) = 1 - P(X ≤ 1)P(X ≤ 1) = P(X = 0) + P(X = 1) = 0.0067 + 0.0337 = 0.0404
Now, P(X ≥ 2) = 1 - P(X ≤ 1) = 1 - 0.0404 = 0.9596
Therefore, the probability of at least 2 customers entering the mall in a 20-minute period is 0.9596.5) At most, 1 customer will enter the mall in a 20-minute period. Here, we need to find the probability of 0 or 1 customers entering the mall in 20 minutes.
P(X ≤ 1) = P(X = 0) + P(X = 1) = 0.0067 + 0.0337 = 0.0404Therefore, the probability of at most 1 customer entering the mall in a 20-minute period is 0.0404.
To summarize, the probabilities of the given events are:
P(X = 6) = 0.0127 (approx)
P(X = 0) = 0.0067 (approx)
P(X = 1) = 0.0337 (approx)
P(X ≥ 2) = 0.9596 (approx)
P(X ≤ 1) = 0.0404 (approx)
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What is the area and uncertainty in area of one side of a rectangular wooden board that has a length of (21.4±0.4)cm
2
and a width of (9.8 ±0.1)cm ? (Give your answers in cm
2
.) (4.9□±cm
2
(b) What If? If the thickness of the board is (1.2±0.1)cm, what is the volume of the board and the uncertainty in this volume? (Give your answers in cm³.) (4.9□±4.9□∣cm
3
The volume of the wooden board is (249.984 ± 1.414) cm³.
Given information: Length of rectangular wooden board, l = (21.4 ± 0.4) cm
Width of rectangular wooden board, w = (9.8 ± 0.1) cm
(a) The area and uncertainty in area of one side of the rectangular wooden board: Area of the wooden board, A = lw
Putting the given values, we get,
A = (21.4 ± 0.4) cm × (9.8 ± 0.1) cm= (21.4 × 9.8) ± (0.4 × 9.8 + 0.1 × 21.4 + 0.1 × 0.4) cm²= 209.72 ± 1.09 cm²
Therefore, the area of one side of the rectangular wooden board is (209.72 ± 1.09) cm².
(b) The volume and uncertainty in volume of the rectangular wooden board: Volume of the wooden board, V = lwh
Given thickness of wooden board, h = (1.2 ± 0.1) cm
Putting the given values, we get,V = (21.4 ± 0.4) cm × (9.8 ± 0.1) cm × (1.2 ± 0.1) cm= (21.4 × 9.8 × 1.2) ± (0.4 × 9.8 × 1.2 + 0.1 × 21.4 × 1.2 + 0.1 × 0.4 × 1.2) cm³= 249.984 ± 1.414 cm³
Therefore, the volume of the wooden board is (249.984 ± 1.414) cm³.
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Part # (a)
A group of shafts are to be machined to 25.500 mm with a tolerance of ±0.030. If a sample of 200 is taken and is found to have minimum diameter of 25.470 mm, what must be the standard deviation in order to assume that 95% of shafts are within the acceptable dimension? Assume normal distribution.
Part # (b)
A shipment of 150 steel pins has been checked for diameter with GNG gages. The pins were to be machined to 0.375 in. in diameter with a tolerance of ±0.003. Four pins were rejected as being undersize while six were rejected as being oversize. Assume a normal distribution and calculate the standard deviation and mean.
The standard deviation of 0.00085 and the mean of 0.375 can be used to determine the probability of the steel pins being undersized or oversize using the normal distribution formula.
According to the given question, it is clear that there are two factors, which are the required dimensions of the shafts, and the sample size of 200.The minimum diameter is 25.470 mm, and the tolerance is ±0.030. Therefore, the upper and lower limits are given below:
Upper limit = 25.530 mm
Lower limit = 25.470 mm
So, the difference between the upper and lower limits is (25.530 - 25.470) = 0.060 mm.
Therefore, the half of the tolerance is (0.030 / 2) = 0.015 mm.
Therefore, the standard deviation (s) can be determined by the following formula:s = 0.015 / 1.96 (since the sample size is 200) = 0.00192
The tolerance of the steel pins is ±0.003, and the diameter of the pins is 0.375.
There are two factors in this problem as well, which are the undersize and oversize steel pins.
The probability of a steel pin being undersized can be determined by the following formula:
P(x < 0.372) = P(z < (0.372 - 0.375) / s) where s is the standard deviation of the steel pins.
The probability of a steel pin being oversize can be determined by the following formula:
P(x > 0.378) = P(z > (0.378 - 0.375) / s)
The probabilities of undersized and oversize steel pins are equal. Therefore, the probabilities can be added and equated to 0.2 (since there are 4 undersize and 6 oversize steel pins out of 150) and solved for s.
Therefore, the standard deviation (s) is calculated to be 0.00085 and the mean is calculated to be 0.375.
In conclusion, the standard deviation of 0.00085 and the mean of 0.375 can be used to determine the probability of the steel pins being undersized or oversize using the normal distribution formula.
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a. Which of the following items are within tolerance? b. What is the percent accuracy by item?
a) The items within tolerance are Item 1 and Item 3.b) The percent accuracy by item cannot be calculated without specific measurements and tolerance ranges for each item.
To determine which items are within tolerance, we need to compare their measurements to the specified tolerance range. Without specific data or measurements provided, it is not possible to give an exact answer.
However, based on the given information, we can infer that Item 1 and Item 3 meet the tolerance criteria. The status of other items cannot be determined without additional details.
Percent accuracy is calculated by comparing the measured value to the target value and expressing it as a percentage.
However, without knowing the actual measurements or target values for each item, it is not possible to calculate the percent accuracy. To determine the percent accuracy by item, specific measurements and tolerance ranges for each item are needed.
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When a z test for a proportion can be used, the standard deviation
is the square root of n*p*q, where n is the sample size, p is the
probability of success, and q is the probability of failure. TRUE
o
False. The statement when a z test for a proportion can be used, the standard deviation is the square root of n*p*q, where n is sample size, p is the probability of success, and q is probability of failure. is incorrect.
When conducting a z-test for a proportion, the standard deviation is not the square root of n * p * q. Instead, it is calculated as the square root of (p * q) / n.
In a z-test for a proportion, we are comparing a sample proportion to a known population proportion or a hypothesized proportion. The standard deviation represents the variability in the proportion estimates.
The formula for the standard deviation in a z-test for a proportion is derived from the binomial distribution. The binomial distribution describes the probability of success (p) and failure (q) in a fixed number of independent Bernoulli trials.
To calculate the standard deviation, we divide the product of the estimated proportion of success (p) and the estimated proportion of failure (q) by the sample size (n). Taking the square root of this value gives us the standard deviation.
By using the correct standard deviation in the z-test formula, we can determine the z-statistic, which measures the number of standard deviations the sample proportion is away from the population or hypothesized proportion. This z-statistic is then used to calculate the p-value or compare against critical values to assess the statistical significance of the observed proportion.
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A snowgoose flies directly south for winter a distance of 250 km. In summer the snowgoose flies north 250 km. a. Draw and label and write vector equations for the two flights. b. What total distance did the snowgoose fly. c. What is the displacement (final position relative to the initial position) of the snowgoose for the winter flight? Write a vector equation d. What is the displacement of the snowgoose for the summer flight? Write a vector equation. e. What is the total displacement after the two flights? Write an equation to establish your answer. f. What is the mathematical and geometric (vector arrows) relationship between the two displacement vectors of answers (c \& d)?
A snowgoose flies 250 km south for winter and returns 250 km north for summer. The total distance flown is 500 km, while the displacement after both flights is zero.
In the first flight, the snowgoose flies directly south for winter, covering a distance of 250 km. This can be represented by the vector equation: Winter Flight = -250 km (south).
In the second flight, during the summer, the snowgoose flies directly north for 250 km. This can be represented by the vector equation: Summer Flight = 250 km (north).
The total distance flown by the snowgoose is the sum of the distances covered in both flights: 250 km + 250 km = 500 km.
The displacement of the snowgoose for the winter flight is zero since it returns to its initial position. This can be represented by the vector equation: Displacement (Winter) = 0 km.
Similarly, the displacement of the snowgoose for the summer flight is also zero as it returns to its initial position. This can be represented by the vector equation: Displacement (Summer) = 0 km.
The total displacement after the two flights is zero, as the snowgoose ends up at the same position it started. This can be represented by the equation: Total Displacement = Displacement (Winter) + Displacement (Summer) = 0 km + 0 km = 0 km.
Mathematically and geometrically, the relationship between the two displacement vectors (Displacement Winter and Displacement Summer) is that they cancel each other out, resulting in a net displacement of zero.
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To determine what students at a school would be willing to do to help address global warming, researchers take a random sample of 100 students. The students answer the questions, "How high of a tax would you be willing to add to gasoline (per gallon) in order to encourage drivers to drive less or to drive more fuel-efficient cars?" and, "Do you believe (yes or no) that global warming is a serious issue that requires immediate action?" The researchers want to compare the mean response on gasoline taxes (the first question) for those who answer yes and for those who answer no to the second question. Complete parts a through c below.
a. Identify the response variable and the explanatory variable.
What is the response variable?
A. The fuel efficiency of the cars.
B. The amount of tax the student is willing to add to a gallon of gasoline.
C. Whether the student believes that global warming is a serious issue or not
COD. Whether the person in the sample is a student at your school or not.
What is the explanatory variable?
The response variable is the amount of tax, whereas the explanatory variable is whether the student believes global warming is a serious issue or not.
An explanatory variable is a variable that can influence another variable or cause changes in the response variable. It is the variable that is controlled or manipulated to study its effect on the dependent variable (response variable) and is an independent variable in statistical analysis. The response variable is a dependent variable or an output variable that changes based on the influence of other variables (explanatory variable).The researchers wanted to compare the mean response on gasoline taxes (the first question) for those who answer yes and for those who answer no to the second question. Therefore, the response variable is the amount of tax the student is willing to add to a gallon of gasoline. This response variable is an indication of how much students are willing to pay to mitigate global warming. On the other hand, the explanatory variable is whether the student believes that global warming is a serious issue or not. This variable will help determine if students' perception of global warming has any effect on their willingness to pay for mitigative measures.
In conclusion, the response variable in the given scenario is the amount of tax, while the explanatory variable is students' perception of global warming.
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Show ALL WORK to identify the asymptotes AND state the end behavior of the function f(x)= 4x/x-16
The function has a vertical asymptote at x = 16.
The function has a horizontal asymptote at y = 4.
The end behavior of the function is that it approaches the horizontal asymptote y = 4 as x approaches positive or negative infinity.
To find the asymptotes and determine the end behavior of the function
[tex]f(x) = \frac{4x}{(x - 16)}[/tex],
we need to analyze the behavior of the function as x approaches certain values.
Vertical Asymptote: Vertical asymptotes occur when the denominator of a function approaches zero while the numerator remains finite.
In this case, the vertical asymptote occurs when [tex]x - 16 = 0[/tex] since division by zero is undefined.
Solving for x, we get:
[tex]x - 16 = 0[/tex]
[tex]x = 16[/tex]
Therefore, the vertical asymptote of the function
[tex]f(x) = \frac{4x}{(x - 16)}[/tex] is [tex]x = 16[/tex].
Horizontal Asymptote: To determine the horizontal asymptote, we examine the degree of the numerator and the denominator of the function.
The degree of the numerator is 1 (highest power of x is [tex]x^1 = x[/tex]), and the degree of the denominator is also 1 (highest power of x is [tex]x^1 = x[/tex]).
Since the degrees are the same, we divide the leading coefficients to find the horizontal asymptote.
The leading coefficient of the numerator is 4, and the leading coefficient of the denominator is 1.
Dividing 4 by 1, we find that the horizontal asymptote is [tex]y = \frac{4}{1} = 4[/tex].
Therefore, the horizontal asymptote of the function
[tex]f(x) = \frac{4x}{(x - 16)}[/tex] is [tex]y = 4[/tex].
End Behavior: The end behavior describes the behavior of the function as x approaches positive or negative infinity.
As x approaches positive infinity (x → +∞), the function [tex]f(x) = \frac{4x}{(x - 16)}[/tex]
behaves similarly to the ratio of their leading terms, which is [tex]\frac{4x}{x } = 4[/tex].
Thus, the end behavior is that the function approaches the horizontal asymptote y = 4 as x goes to positive infinity.
As x approaches negative infinity (x → -∞), the function [tex]f(x) = \frac{4x}{(x - 16)}[/tex]
can be rewritten as [tex]\frac{-4x}{(-x + 16)}[/tex].
Here, we observe that the leading terms cancel out, leaving [tex]\frac{-4}{(-1)} = 4[/tex]. Therefore, the end behavior is that the function also approaches the horizontal asymptote y = 4 as x goes to negative infinity.
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What sum of money should Jeff invest on January 21, 2020, to
amount to $80000 on August 8, 2020, at 5% p.a.
To determine the sum of money Jeff should invest on January 21, 2020, in order to reach $80000 on August 8, 2020, at an annual interest rate of 5%, we need to calculate the present value of the future amount using the time value of money concepts.
We can use the formula for the present value of a future amount to calculate the initial investment required. The formula is:
Present Value = Future Value / (1 + interest rate)^time
In this case, the future value is $80000, the interest rate is 5% per year, and the time period is from January 21, 2020, to August 8, 2020. The time period is approximately 6.5 months or 0.542 years.
Plugging these values into the formula, we have:
Present Value = $80000 / (1 + 0.05)^0.542
Evaluating the expression, we find that the present value is approximately $75609. Therefore, Jeff should invest approximately $75609 on January 21, 2020, to amount to $80000 on August 8, 2020, at a 5% annual interest rate.
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Dr. Strange throws a ball straight up into the air and the quadratic equation that describes yields the times for its motion is (4.90 m/s
2
)t
2
−(8.71 m/s)t−2.62 m=0. What are the solutions to this equation? (Please note that these numbers could be very different from the first problem.)
0.265,−2.045
0.265,−2.045
0.265,2.045
−0.265,2.045
The solutions to the quadratic equation are approximately t = 2.045 and t = -0.265.
To find the solutions to the quadratic equation, we can use the quadratic formula:
Given the equation: (4.90 m/s²)t² - (8.71 m/s)t - 2.62 m = 0
The quadratic formula is given by: t = (-b ± √(b² - 4ac)) / (2a)
In this case, a = 4.90 m/s², b = -8.71 m/s, and c = -2.62 m.
Plugging these values into the quadratic formula, we have:
t = [(-(-8.71) ± √((-8.71)² - 4(4.90)(-2.62))) / (2(4.90)]
Simplifying further:
t = [(8.71 ± √(75.9841 + 51.12)) / (9.80)]
t = [(8.71 ± √(127.1041)) / (9.80)]
t = [(8.71 ± 11.278) / 9.80]
Now, calculating the two possible solutions:
t1 = (8.71 + 11.278) / 9.80 ≈ 2.045
t2 = (8.71 - 11.278) / 9.80 ≈ -0.265
So, the solutions to the quadratic equation are approximately t = 2.045 and t = -0.265.
Therefore, the correct answer is: -0.265, 2.045
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A particular fruit's weights are normally distributed, with a mean of 376 grams and a standard deviation of 11 grams. If you pick one fruit at random, what is the probability that it will weigh between 362.8 grams and 374.9 grams?
The probability that a randomly picked fruit will weigh between 362.8 grams and 374.9 grams can be calculated using the standard normal distribution and the z-score formula .
To find the probability, we need to calculate the z-scores for the lower and upper bounds. The z-score is given by (X - μ) / σ, where X is the value, μ is the population mean, and σ is the population standard deviation.
For the lower bound, the z-score is (362.8 - 376) / 11 ≈ -1.2, and for the upper bound, the z-score is (374.9 - 376) / 11 ≈ -0.1091. Using a standard normal table or calculator, we can find the corresponding probabilities for these z-scores.
The probability corresponding to the lower z-score is approximately 0.1151, and the probability corresponding to the upper z-score is approximately 0.4573. To find the probability within the range, we subtract the lower probability from the upper probability:
0.4573 - 0.1151 = 0.3422. Therefore, the probability that a randomly picked fruit will weigh between 362.8 grams and 374.9 grams is approximately 0.3422, or 34.22%.
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Answer the following. Do not forget to show your work: a) Convert 15.0625 into an IEEE single precision value. b) Convert 1.50625 into an IEEE double precision value. c) Add (a) and (b) together. What is the answer? Be clear on the operations performed.
a. The IEEE single precision value is
0 10000011 11110001000000000000000
b. The IEEE double precision value is:
0 10000000011 1100101011000000000000000000000000000000000000000000.
a) To convert 15.0625 into an IEEE single precision value:
Step 1: Convert the integer part of 15 to binary.
15 divided by 2 is 7 with a remainder of 1.
7 divided by 2 is 3 with a remainder of 1.
3 divided by 2 is 1 with a remainder of 1.
1 divided by 2 is 0 with a remainder of 1.
Reading the remainders from the last division upwards, we get 1111.
Step 2: Convert the fractional part of 0.0625 to binary.
0.0625 multiplied by 2 is 0.125. Take the integer part, which is 0.
0.125 multiplied by 2 is 0.25. Take the integer part, which is 0.
0.25 multiplied by 2 is 0.5. Take the integer part, which is 0.
0.5 multiplied by 2 is 1.0. Take the integer part, which is 1.
Reading the integers from the first multiplication downwards, we get 0001.
Step 3: Combine the sign bit, exponent, and mantissa.
The sign bit is 0 (since 15.0625 is positive).
The exponent is 4, which is bias-corrected by adding 127, resulting in 131. In binary, 131 is 10000011.
The mantissa is obtained by combining the integer part and the fractional part from Steps 1 and 2, resulting in 1111.0001.
The IEEE single precision value is:
0 10000011 11110001000000000000000
b) To convert 1.50625 into an IEEE double precision value:
Step 1: Convert the integer part of 1 to binary.
1 divided by 2 is 0 with a remainder of 1.
Reading the remainder, we get 1.
Step 2: Convert the fractional part of 0.50625 to binary.
0.50625 multiplied by 2 is 1.0125. Take the integer part, which is 1.
0.0125 multiplied by 2 is 0.025. Take the integer part, which is 0.
0.025 multiplied by 2 is 0.05. Take the integer part, which is 0.
0.05 multiplied by 2 is 0.1. Take the integer part, which is 0.
0.1 multiplied by 2 is 0.2. Take the integer part, which is 0.
0.2 multiplied by 2 is 0.4. Take the integer part, which is 0.
0.4 multiplied by 2 is 0.8. Take the integer part, which is 0.
0.8 multiplied by 2 is 1.6. Take the integer part, which is 1.
Reading the integers from the first multiplication downwards, we get 1001010.
Step 3: Combine the sign bit, exponent, and mantissa.
The sign bit is 0 (since 1.50625 is positive).
The exponent is 4, which is bias-corrected by adding 1023, resulting in 1027. In binary, 1027 is 10000000011.
The mantissa is obtained by combining the integer part from Step 1 and the fractional part from Step 2, resulting in 1100101011.
The IEEE double precision value is:
0 10000000011 1100101011000000000000000000000000000000000000000000
c) Adding the IEEE single precision value from part (a)
and the IEEE double precision value from part (b) together would require converting both values to decimal, performing the addition, and then converting the result back to IEEE format. However, since the desired result is not explicitly specified, I cannot provide an answer without the specific decimal value to be added.
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What is equal to P(A∣B)×P(B) ? Nothing is equal to P(A∣B) P(A and B) P(A) P(B∣A)
The expression P(A∣B)×P(B) represents the probability of event A occurring given event B, multiplied by the probability of event B occurring.
In probability theory, P(A∣B) represents the conditional probability of event A given that event B has occurred. P(B) represents the probability of event B occurring. When these two probabilities are multiplied, we obtain the expression P(A∣B)×P(B), which gives us the joint probability of both events A and B occurring together. It quantifies the likelihood of event A occurring after considering event B, and then adjusting it by the probability of event B occurring.
In probability theory, P(A∣B)×P(B) is equal to P(A and B). The expression P(A∣B) represents the probability of event A occurring given that event B has already occurred, while P(B) represents the probability of event B occurring. Multiplying these probabilities together gives the probability of both events A and B occurring simultaneously, denoted as P(A and B). This calculation is based on the multiplication rule of probability. The result provides insight into the joint occurrence of events A and B, taking into account the conditional probability of A given B.
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If x = (2 + sqrt(5)) find the value of x + 1 / x
The value of [tex]\frac{x + 1}{x}[/tex], when [tex]x = (2 +\sqrt{5} )[/tex], is [tex]-4[/tex].
To find the value of [tex]\frac{x + 1}{x}[/tex], we substitute the given value of x into the expression and perform the necessary calculations.
Let's start by substituting [tex]x= (2 + \sqrt{5} )[/tex] into [tex]\frac{x + 1 }{x}[/tex]:
[tex]\frac{x + 1}{x} = (2 +\sqrt{5} ) + \frac{1}{ (2 + \sqrt{5} )}[/tex]
To simplify the expression, we need to rationalize the denominator of the second term.
Multiply the numerator and denominator of the second term by the conjugate of the denominator:
[tex]\frac{x + 1}{x } = \frac{(2+\sqrt{5} )+1 \times (2 - \sqrt{5}) }{(2 + \sqrt{5} )) \times (2 - \sqrt{5} )}[/tex]
Multiplying the numerator and denominator of the second term:
[tex]\frac{x + 1}{x} = \frac{ (2 + \sqrt{5})+(2-\sqrt{5} ) }{ [4 - 5]}[/tex]
Simplifying further:
x + 1 / x = (2 + sqrt(5)) + (2 - sqrt(5)) / (-1)
[tex]\frac{x + 1 }{x} = \frac{(1+\sqrt{5}) +(2-\sqrt{5} ) }{ (-1)}[/tex]
Combining the like terms in the numerator:
[tex]\frac{x + 1 }{x} =\frac{4}{ (-1)}[/tex]
Simplifying the expression:
[tex]\frac{x + 1 }{x} = -4[/tex]
Therefore, the value of [tex]\frac{x + 1 }{x}[/tex], when [tex]x=(2+\sqrt{5} )[/tex], is [tex]-4[/tex].
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2 b. Find the domain of f−1(x) 2a. Determine the inverse function for: Be sure to show your work. f(x)=x2−6;x≥0. Be sure to show your work.
The domain of f⁻¹(x) is {x : x ≥ -6}.
The inverse function for f(x) = x² - 6
Given, the function f(x) = x² - 6, where x ≥ 0, we need to determine the inverse function and find the domain of f⁻¹(x).
Let y = f(x)
Then, y = x² - 6... (1)
We need to find the inverse function.
f(x) = y ⇒ x² - 6 = y ⇒ x² = y + 6
Taking square root on both sides, we get,x = ±√(y + 6)
Since x ≥ 0, the inverse of f(x) will be,f⁻¹(x) = √(x + 6), x ≥ 0
Domain of f⁻¹(x) = Range of f(x)
Range of f(x) = {y : y = f(x), x ≥ 0}y = x² - 6, x ≥ 0
For x = 0, y = -6
For x > 0, the values of y increases without bound
Therefore, Range of f(x) = {y : y ≥ -6}
Domain of f⁻¹(x) = {x : x ≥ -6}
Therefore, the inverse function for f(x) = x² - 6, where x ≥ 0 is given byf⁻¹(x) = √(x + 6)
The domain of f⁻¹(x) is {x : x ≥ -6}.
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