Answer:
that no. is 20
Step-by-step explanation:
let us take that certain no. as x
so
2/5. x +2=10
2x/5 = 10-2
2x = 8×5
x= 40/2
x= 20
how many solutions are in -2(6-3x)=-12+6x ?
Answer:
For this equation there are infinite solutions.
Step-by-step explanation:
-2(6-3x)=-12+6x
-12+6x= -12 + 6x
-6 -6
-12 = -12
0 = 0
Which ordered pairs are solutions to the system of inequalities?
More than one answer
y ≥ x + 2
y > -5/2x - 3.
A. (0,0)
B. (-2,2)
C. (0,2)
D. (-1,6)
Answer:
C, D
Step-by-step explanation:
We can solve this graphically and analytically.
Graphically, looking at the attached image below, if we graph the two inequalities and plot the points, you can find the points which are solutions by finding the points in the overlapping area.
This obviously excludes A as it only appears in [tex]y \geq x+2[/tex]
C is included as y [tex]\geq x+2[/tex] includes the point on the line.
D is obviously a solution.
B is however not a solution because is lies on the line [tex]y = \frac{-5x}{2} - 3[/tex], which the inequality excludes.
Analytically, if we can find one of the two inequalities where it is not a solution, it is not a solution of the system.
A: (0, 0)
[tex]y \geq x+2\\0 \geq 0 + 2\\0 \geq 2\\false[/tex]
A is not a solution
B: (-2, 2)
[tex]y \geq x+2\\2 \geq -2 + 2\\2\geq 0\\true[/tex]
[tex]y > \frac{-5x}{2} -3\\2 > \frac{-5(-2)}{2} - 3\\2 > 5 - 3\\2 > 2\\false[/tex]
B is not a solution
C: (0, 2)
[tex]y \geq x+2\\2 \geq 0 + 2\\2 \geq 2\\true\\\\y>\frac{-5x}{2}-3\\2 > -3\\true[/tex]
C is a solution
D:
[tex]y \geq x + 2\\6 \geq -1 + 2\\6 \geq 1\\true\\\\y > \frac{-5x}{2} - 3\\6 > \frac{-5(-1)}{2} - 3\\6 > \frac{5}{2} - \frac{6}{2}\\6 > \frac{-1}{2}\\true[/tex]
D is a solution
hellllp meeeeeeee plzzzz
Answer: 75 68 28 77
Step-by-step explanation:
make circle
make 4 parts in the circle
make one 75 degrees
another one 68
another one 28
and last one 77
Jeff ordered 5 pizzas for his daughters birthday
party. Each pizza has 8 slices. At the party, 50%
of the pizzas were eaten. When the party was
over, Jeff ate 20% of what was left. How many
did Jeff eat?
Answer:8 peices hopefully its right
Step-by-step explanation:
5n(-7n)+6
How do you solve this
Answer:
-35n+6
Step-by-step explanation:
5n(-7n)+6
Okay so there is a term in front of another term in parentheses
This let's us know that we are going to distribute (multiply)
5n × -7n = -35n^2
The reason it's -35 it's because a positive times a negative is a negative
the reason it's n^2 it's because n × n = n^2
Now we can't forget the positive 6!
-35n + 6 is your answer
The reason we don't add the 6 to the -35n is because they are not like terms so therefore we cannot do anything further
The 6 does not have an n attached to it so we leave as it it
Twice more than the product of a number and 8 is equal to 3
Answer:
Step-by-step explanation:
8x+2=3
8x=1
x=1/8
Is my answer correct or incorrect? True or false
Answer:
Youre correct
Step-by-step explanation:
Answer:
it is true
Step-by-step explanation:
solve the system
y=3x^2+3x-5
2x-y=3
The combined height of the world’s three tallest buildings is 6,360 feet. The building in Dubai is 745 feet taller than the building in Makkah. Taipei’s building is 301 feet shorter than Makkah’s.
The equation (x + 745) + x + (x – 301) = 6,360 represents the scenario.
What can be determined from the given information? Check all that apply.
x represents the height of the building in Dubai.
The expression (x – 301) represents the height of the building in Taipei.
The building in Makkah is 1,972 feet tall.
The height of Dubai’s building is 1,227 feet tall.
The height of Taipei’s building is 1,671 feet tall.
Answer:
B, C, and E are correct
Step-by-step explanation:
Answer:
the answers are B, C, and E
Step-by-step explanation:
got it right on edge 2021 hope this helped! :]
Solve this system of equations 2x+4y=-6 x=y-12
Answer:
Step-by-step explanation:
2(y-12) +4y = -6
2y -24 +4y = -6
6y -24 = -6
6y= -18
y = -3
x = -3 - 12
x = - 15
x = -15
y = -3
Answer:
x=-9, y=3
Step-by-step explanation:
2(-9)=-18 4(3)=12 -18+12=-6 so, -6=-6, it is determined true
-9=3-12 3-12=-9 so, -9=-9, it is determined true
Hope this helps! Have a nice day! Owa Owa!
Evaluate the following trigonometric expression, using the principal value for the cosine
tan(Cos-1(-1/2))
Given:
The expression is
[tex]\tan (\cos ^{-1}(-\dfrac{1}{2}))[/tex]
To find:
The value of given expression.
Solution:
We have,
[tex]\tan (\cos ^{-1}(-\dfrac{1}{2}))[/tex]
[tex]=\tan (\pi-\cos^{-1}(\dfrac{1}{2}))[/tex] [tex][\because \cos^{-1}(-\theta)=\pi -\cos^{-1}\theta][/tex]
[tex]=\tan (\pi-\cos^{-1}(\cos \dfrac{\pi}{3}))[/tex] [tex][\because \cos \dfrac{\pi}{3}=\dfrac{1}{2}][/tex]
[tex]=\tan (\pi-\dfrac{\pi}{3})[/tex]
[tex]=-\tan (\dfrac{\pi}{3})[/tex] [tex][\because \tan(\pi-\theta)=-\tan \theta][/tex]
[tex]=-\sqrt{3}[/tex] [tex][\because \tan \dfrac{\pi}{3}=\sqrt{3}][/tex]
Therefore, the value of given expression is [tex]-\sqrt{3}[/tex].
The average body burns 120 calories (y) every 8 minutes (x) of jumping rope. Which equation best represents the number of calories burned, y, when x number of minutes have passed?
Answer:
y=15x
Step-by-step explanation:
please help marking brainliest if its correct!
Answer:
I would say B.120 minutes
Helppppp BRAINLEST if right ASAP
Answer:
21.9
Step-by-step explanation:
PLEASEEEEE HELP!!!! 15 POINTS AND DONT PUT SOMETHING RANDOM ITS DUE SOON!!
Answer:
third option
triangle TSU=LMN
Answer:
[tex] \triangle TSU \: \cong\: \triangle LMN[/tex]
Step-by-step explanation:
[tex] In\: \triangle TSU \: \&\: \triangle LMN\\\\
TS \cong LM\\\\
SU\cong MN\\\\
UT\cong NL\\\\
\therefore \triangle TSU \: \cong\: \triangle LMN\\(By\: SSS \: Postulate) [/tex]
(Ill give brainliest if ya help meee!! ;-;)
Which equation has a value less than 2,175?
A) 1 x 2,175 = ________
B)2 x 2,175 = ________
C) two halves x 2,175 = ________
D)one half x 2,175 = ________
Answer:
D
Step-by-step explanation:
1/2*almost anything except 1 and 0 is pretty much just dividing by 2
It's D.
1/2 x 2175 = 2175/2
2175/2 = 1087.5
Ben can address the weekly newsletters in 4 hours, Charlie can address them in 3 hours. How long would it take
them to address the newsletters if they work together?
Find the slope and y intercept from the
table below
x
1-3
1-2
-1
O
1
1
2
У
-16
1-10
-4
2
8
14
Answer:
100
Step-by-step explanation: : )
.
1 a) A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean.b) Repeat part (a) with a sample size of 100.c) Repeat part (a) with a sample size of 400.d) Describe what happens to the confidence interval estimate when the sample size increases.2 a) The mean of a sample of 25 was calculated as ¯x=500. The sample was randomly drawn from a population with a standard deviation of 15. Estimate the population mean with 99% confidence.b) Repeat part (a) changing the population standard deviation to 30.c) Repeat part (a) changing to the population standard deviation to 60.d) Describe what happens to the confidence interval estimate when the standard deviation is increased.
Answer:
1a)Confidence Interval: (77.936,82.064)
b)Confidence Interval: (79.020, 80.980)
c)Confidence Interval: (79.510, 80.490)
d) As the sample size increases, the confidence interval for the lower class (bound) increases while that of the upper class(bound) decreases.
2a)Confidence Interval: (491.609
, 502.797)
b)Confidence Interval: (483.218, 516.782)
c)Confidence Interval: (466.436,533.564)
d)As the standard deviation increases, the confidence interval for the lower class (bound) decreases while that of the upper class(bound) increases.
Step-by-step explanation:
1 a) A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80.
The formula for confidence Interval is:
C.I = Mean ± z score × Standard deviation/√n
Note to apply the formula above n greater than or equal to 30
a) Determine the 95% confidence interval estimate of the population mean.
For a, the confidence interval formula above cannot be applied because n is less than 30, so we use the t score confidence interval value
C.I = Mean ± t score × Standard deviation/√n
Mean = 80
Standard deviation = 5
n = 25
Degree of freedom = 25 - 1 = 24
Hence, 95% confidence interval degree of freedom t score = 2.064
Hence, Confidence Interval =
80 ± 2.064 × 5/√25
80 ± 2.064 × 1
80 ± 2.064
Confidence Interval =
80 - 2.064
= 77.936
80 + 2.064
= 82.064
Confidence Interval: (77.936, 82.064)
b) Repeat part (a) with a sample size of 100.
C.I = Mean ± z score × Standard deviation/√n
Mean = 80
Standard deviation = 5
n = 100
z score for 95% confidence interval = 1.96
C.I = 80 ± 1.96 × 5/√100
C.I = 80 ± 1.96 × 5/10
C.I = 80 ± 1.96 × 0.5
C.I = 80 ± 0.980
Confidence Interval =
80 - 0.980
= 79.020
80 + 0.980
= 80.980
Confidence Interval: (79.020, 80.980)
c) Repeat part (a) with a sample size of 400.
C.I = Mean ± z score × Standard deviation/√n
Mean = 80
Standard deviation = 5
n = 400
z score for 95% confidence interval = 1.96
C.I = 80 ± 1.96 × 5/√400
C.I = 80 ± 1.96 × 5/20
C.I = 80 ± 1.96 × 0.25
C.I = 80 ± 0.490
Confidence Interval =
80 - 0.490
= 79.510
80 + 0.490
= 80.490
Confidence Interval: (79.510, 80.490)
d) As the sample size increases, the confidence interval for the lower class (bound) increases while that of the upper class(bound) decreases.
2a) The mean of a sample of 25 was calculated as ¯x=500. The sample was randomly drawn from a population with a standard deviation of 15.
For a,b and c the confidence interval formula above cannot be applied because n is less than 30, so we use the t score confidence interval value
C.I = Mean ± t score × Standard deviation/√n
a) Mean = 500
Standard deviation = 15
n = 25
Degree of freedom = 25 - 1 = 24
Hence, 99% confidence interval degree of freedom t score = 2.064
Hence, Confidence Interval =
500 ± 2.797 × 15/√25
500 ± 2.797 × 15/5
500 ± 2.797 × 3
Confidence Interval =
500 - 8.391
= 491.609
500 + 8.391
= 508.391
Confidence Interval: (491.609, 508.391)
b) Repeat part (a) changing the population standard deviation to 30
Hence, Confidence Interval =
500 ± 2.797 × 30/√25
500 ± 2.797 × 30/5
500 ± 2.797 × 6
500 ± 16.782
Confidence Interval =
500 - 16.782
= 483.218
500 + 16.782
= 516.782
Confidence Interval: (483.218, 516.782)
c) Repeat part(a) changing to the population standard deviation to 60.
Hence, Confidence Interval =
500 ± 2.797 × 60/√25
500 ± 2.797 × 60/5
500 ± 2.797 × 12
500 ± 33.564
Confidence Interval =
500 - 33.564
= 466.436
500 + 33.564
= 533.564
Confidence Interval: (466.436,533.564)
d)As the standard deviation increases, the confidence interval for the lower class (bound) decreases while that of the upper class(bound) increases.
Please answer this question:
Which confidence level has the largest percent containing the population mean? Circle one.
Please answer fast
Answer:
95%
Confidence levels range from 80% to 99%,with the most common confidence level being 95%.
Choosing a Confidence Level for a Population Sample.
Confidence Level z*-value
Is this right need answer ASAP
what would be the square root of 144 is it 12?
Answer:
yes the square root of 144 is 12
Step-by-step explanation:
12 x 12 = 144 and 144 divided by 12 = 12
Name 2 alternate exterior angles
Answer:
When two lines are crossed by another line (called the Transversal): Alternate Exterior Angles are a pair of angles on the outer side of each of those two lines but on opposite sides of the transversal. In this example, these are two pairs of Alternate Exterior Angles: a and h.
Step-by-step explanation:
Priya, Han, Lin, and Diego are all on a camping trip with their families. The first morning, Priya and Han make oatmeal for the group. The instructions for a large batch say, “Bring 15 cups of water to a boil, and then add 6 cups of oats.”
Priya says, “The ratio of the cups of oats to the cups of water is
6:15
. That’s 0.4 cups of oats per cup of water.”
Han says, “The ratio of the cups of water to the cups of oats is
15:6
. That’s 2.5 cups of water per cup of oats.”
Who is correct? Explain your reasoning. If you get stuck, consider using the table.
Answer:
Han is because the cups of water is 15 ad oat is 6.
Step-by-step explanation:
Answer:
Han is correct
Step-by-step explanation:
barb exercises for 22 hours each week. how many hours does she exercise in 14 weeks. use the array drawn on the grid go help multiply
Answer:
Step-by-step explanation:
22 times 14 is 308, so 308 hours in 14 weeks.
can someone help me with this
Answer: The answer is (19, 17), (20, 18), (21, 19), (22, 20), and (23, 21).
Step-by-step explanation:
The Bartlett family is taking a road trip to Yellowstone National Park! Yesterday, they drove a total of 550 miles in 11 hours. Today, they will drive another 200 miles and arrive at the park.
If the Bartletts drive at the same average rate, how long will they drive today?
Answer:
4 hours is the answer
Step-by-step explanation:
If the Bartletts drive at the same average rate, today they must have derived for 4 hours.
Given that,
They drove a total of 550 miles in 11 hours. Today, they will drive another 200 miles and arrive at the park. If the Bartletts drive at the same average rate, how long will they drive today is to be determined.
Distance is defined as the object traveling at a particular speed in time from one point to another.
Here,
Speed = distance/time
Speed = 550 / 11 = 50 miles per hour
Again,
Speed = distance/time
50 = 200 / time
time = 4 hours,
Thus, If the Bartletts drive at the same average rate, today they must have derived for 4 hours.
Learn more about distance here:
brainly.com/question/15172156
#SPJ5
PLEASE HELP!
I WILL MARK BRAINLIEST!!!
Answer:
x=159/8
Step-by-step explanation:
you are supposed to put all those numbers and x's together and combine like terms then subtract from 180 and then divide
Graph the following linear inequalities y<_1/2x-4
Answer:
Step-by-step explanation:
y ≤ [tex]\frac{1}{2}[/tex] x - 4
Evaluate the expression when c=-6
Answer:
Hi how are you
Step-by-step explanation:
Have a nice day
