Answer:
Part of work left to finish after two work hours is 7/20
Step-by-step explanation:
Firstly, we need to calculate their joint work rate
That will be;
1/(1/5 + 1/8) = 1/(13/40) = 40/13
This means that they will complete the task in 40/13 hours
1 whole part takes 40/13
x part will take 2 hours
x * 40/13 = 2
40x = 26
x = 26/40
So the part that will be completed in two hours is 26/40
This means that the part left to complete will be:
1 - 26/40 = 14/40 = 7/20
Answer:
7/20
Step-by-step explanation:
you need to find what is left, not how much they did (which is 13/20)
y=x-3 somebody?? pls help i cant solve it
Answer:
x=3
Step-by-step explanation:
0=x-3
-x=-3
x=3
Select the correct answer.
Solve the following inequality for x.
x - 9 ≤ 2(9 - x)
A. x ≤ 9
B. x ≥ 11
C. x < -7
D. x < 10
Step-by-step explanation:
x-9≤2(9-x)
distribute
x-9≤18-2x
add 2x on both sides
3x-9≤18
add 9 on both sides
3x≤27
divide by 3
x≤9
Answer:
here is the answer verified by edmentum if anyone needs it
Step-by-step explanation:
Weekly salary: $650; earnings to date: $30,000.
Answer:
Step-by-step explanation:
30000/650= 46.15 weeks to accumulate $30000
ss tax rate is 12.4%
Medicare rate is 0.09%
30,000*12.4%= $3720
30,000*9%= $270
Total is $3990
Per pay period is
650*12.4%= $80.60
650*9%=$58.50
Total is $139.10
Using the exchange rate £1 = $1.32, calculate how many £ are in $11.80. Give
your answer rounded to 2 dp.
Answer:
£8.94
Step-by-step explanation:
Since $1 = £1.32, you can just divide $11.80 by 1.32.
11.80/1.32 = £8.939
£8.939 rounded to 2 dp = £8.94
Answer:
If you do the math 10 euros is 13.20 USD so thats to much so take 1.00 euro away so thats 11.88 USD so its around 8.50 euro for 11.80 USD
Step-by-step explanation:
|x+4 | =8
Dont know this
Answer: 4+4=8
Step by step explanation:
How do I solve this?
A sidewalk has an area that can be represented by the expression (8x + 24) feet. Factor the expression 8x + 24.
Answer:
x3
Step-by-step explanation:
What is 113% of 85?
96.05
0 92.08
O 83.57
O 119.26
Plz help! 10 Points!!
Answer:
96.05
Step-by-step explanation:
Answer:
96.05
Step-by-step explanation:
85 times 113
9605
divided by 100
96.05
Please help fast. I don't know what to do
Answer:
\frac{30}{104}
Step-by-step explanation:
9 is the number of boys who play football AND wrestle. 18 is the mumber of footballers, and 12 is the number of wrestlers.
18 + 12, or 30, is the number of boys who EITHER play football or wrestle.
The total number of boys playing sports is 104, so 30 out of 104 boys either play football or wrestle.
You can write this in fraction form as [tex]\frac{30}{104}[/tex].
Answer:
39/143 (B)
Step-by-step explanation:
All the boys who play football, wrestle, or both equals 18 + 12 + 9 = 39
All of the boys are the boys who play football, wretle, or both (39) + the number of outlier boys, (104) = 143 boys in total.
There is a probability of 39/143 that a boy will wrestle or football.
1.34 - 1.07 mathematics
Answer:
0.27
Step-by-step explanation:
If you subtract 1.07 from 1.34 it would equal 0.27.
Can someone help me with this?
Answer:
8x + 5y > 400
(50, 0) for x-intercept
(0,80) for y-intercept
Step-by-step explanation:
We will let x be the # of tshirts and y be the # of hats.
The inequality is 8x + 5y > 400; the coefficient 8 comes from $8 per tshirt and 5 from $5 per hats.
For x intercept, you let y = 0;
8x + 5(0) = 400;
8x = 400; divide by 8
x = 50 or (50, 0)
For y intercept, you let x = 0;
8(0) + 5y = 400;
5y = 400; divide by 5
y = 80 or (0,80)
GET BRANILIEST IF YOUR RIGHT!!!
Why is 50 miles per hour a unit rate, and 150 miles per 3 hours is n
Answer:
Step-by-step explanation:
In a unit rate, the denominator is always 1. So, to find unit rate, divide the denominator with the numerator in a way that the denominator becomes 1. For example, if 50km is covered in 5.5 hours, the unit rate will be 50km/5.5 hours = 9.09 km/hour.
Answer:
because unit rate means 1 hour not 3 hour.
PLEASE HELP ASAP ILL MARK BRAINLEST
Answer:
best way would be calendar
Step-by-step explanation:
then stop watch
heartbeat
finding height?
(im not totally sure because it depends what type of timekeeping you're talking about)
YOULL BE MADE BRAINLIEST IF YOU ANSWER CORRECTLY
Solve the proportion.
15/8=45/c
c=
Answer:
c=24
Step-by-step explanation:
15/8=45/c
15*c=45*8
15c/15=360/15
c=24
Please answer correctly !!!!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!!!
Answer:
chemical mixture is a collection of molecules or atoms of different types. A mixture is distinguished from a pure substance, which has constant composition (is composed of a only one type of molecule or atom), and a unique set of physical properties (no matter how large or small a sample is observed).
Step-by-step explanation:
Which situations most likely involve the use of decimals? Choose more than one answer.
Counting the number of apples in a basket
Measuring a person's height in meters
Calculating the price of an item after tax
Predicting the next full moon
Comparing the batting averages of two baseball players
Estimating the weight of an elephant
Answer:
Estimating the weight of an elephant
Step-by-step explanation:
Put an elephant onto a large boat and the marker that the water rises to Minus the starting point
solve the triangle a=3 b=13 c=11
A,B,C?
Answer:
uhh i dont get it
Step-by-step explanation:
1.2983 rounded to nearest hundredth
Answer:
1.3000
Step-by-step explanation:
The 9 makes the 2 move to 3. Hope this helps.
Answer:
1.30
Step-by-step explanation:
its rounding to the hundredth
What is the equation of the line?
y=−1/2x+1
y=−1/2x−1
y=2x−1
y=−2x+1
In manufacturing processes, it is of interest to know with confidence the proportion of defective parts. Suppose that we want to be reasonably certain that less than 4% of a company's widgets are defective. To test this, we obtain a random sample of 250 widgets from a large batch. Each of the 250 widgets is tested for defects, and 6 are determined to be defective, based upon the manufacturer's standards. Using α = 0.01, is this evidence that less than 4% of the company's widgets are defective? State the hypotheses, list and check the conditions, calculate the test statistic, find the p-value, and make a conclusion in a complete sentence related to the scenario.
Answer:
Less than 4% of a company's widgets are defective.
Step-by-step explanation:
In this case we want to be reasonably certain that less than 4% of a company's widgets are defective.
The significance level of the test is, α = 0.01.
The hypothesis can be defined as follows:
H₀: At least 4% of a company's widgets are defective, i.e. p ≥ 0.04.
Hₐ: Less than 4% of a company's widgets are defective, i.e. p < 0.04.
The information provided is:
n = 250
x = 6
The sample proportion is, [tex]\hat p=\frac{x}{n}=\frac{6}{250}=0.024[/tex]
Compute the test statistic value as follows:
[tex]z=\frac{\hat p-p}{\sqrt{\frac{p(1-p)}{n}}}\\\\=\frac{0.024-0.04}{\sqrt{\frac{0.04(1-0.04)}{250}}}\\\\=-1.29[/tex]
The test statistic value is -1.29.
The decision rule is:
The null hypothesis will be rejected if the p-value of the test is less than the significance level.
Compute the p-value as follows:
[tex]p-value=P(Z<-1.29)=0.0985[/tex]
So,
p-value = 0.0985 > α = 0.01.
The null hypothesis will not be rejected at 1% significance level.
Thus, there is not enough evidence to support the claim.
Conclusion:
Less than 4% of a company's widgets are defective.
Lisa bought some books. She spent a total of $45 after a discount of $6 off of her total purchase. Each book cost $3. How many books did she buy?
(a) Write an equation that could be used to answer the question above.
First, choose the appropriate form. Then, fill in the blanks with the
numbers 45, 6, and 3. Let b represent the number of books.
Х
5
?
(b) Solve the equation in part (a) to find the number of books.
b=0
Answer:
She spent 17 books
Equation: 45+6 = 51 and 51/3 = 17 books
what is 90,000 in standard form
Answer:
9*10^4
Step-by-step explanation:
Answer:
90,000 is written and 9x 10^4 in scientific notation
Find the slope of the line that contains the points (-10,-16) and (-13,7)
Answer: -23/3
Step-by-step explanation:
M= 7+16/-13+10
Write the number in standard form. 3 × 100 + 4 × 10 + 7 × 1 + 3 × (1/10) + 9 × (1/100) + 2 × (1/1000)
Answer:
374.392
Step-by-step explanation:
3*100=300
4*10=40
7*1=7
3*(1/10)=0.3
9*(1/100)=0.09
2*(1/1000)=0.002
Put them together and you get 347.392
Solve the following pair of equations simultaneously.
See image for question
Answer question (III)
Answer:
No solutions.
General Formulas and Concepts:
Pre-Algebra
Order of Operations: BPEMDASEquality PropertiesAlgebra I
Solving systems of equations using substitution/eliminationSolving systems of equations by graphingExpandingFinding roots of a quadraticStandard Form: ax² + bx + c = 0Quadratic Formula: [tex]x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}[/tex]Step-by-step explanation:
Step 1: Define systems
2x - y = 9
4x² + 3y² - 2x + y = 16
Step 2: Rewrite systems
2x - y = 9
Subtract 2x on both sides: -y = 9 - 2xDivide -1 on both sides: y = 2x - 9Step 3: Redefine systems
y = 2x - 9
4x² + 3y² - 2x + y = 16
Step 4: Solve for x
Substitution
Substitute in y: 4x² + 3(2x - 9)² - 2x + (2x - 9) = 16Expand: 4x² + 3(4x² - 36x + 81) - 2x + (2x - 9) = 16Distribute 3: 4x² + 12x² - 108x + 243 - 2x + 2x - 9 = 16Combine like terms: 16x² - 108x + 234 = 16Factor GCF: 2(8x² - 54x + 117) = 16Divide 2 on both sides: 8x² - 54x + 117 = 8Subtract 8 on both sides: 8x² - 54x + 109 = 0Define variables: a = 8, b = -54, c = 109Resubstitute: [tex]x=\frac{54\pm\sqrt{(-54)^2-4(8)(109)} }{2(8)}[/tex]Exponents: [tex]x=\frac{54\pm\sqrt{2916-4(8)(109)} }{2(8)}[/tex]Multiply: [tex]x=\frac{54\pm\sqrt{2916-3488} }{16}[/tex]Subtract: [tex]x=\frac{54\pm\sqrt{-572} }{16}[/tex]Here we see that we start to delve into imaginary roots. Since on a real number plane, we do not have imaginary roots, there would be no solution to the systems of equations.
Step 5: Graph systems
We can verify our results.
Bryan earns 9$ for each hour of yard work how many hours in all will it take Bryan to earn 27$
Answer:
3 hours
Step-by-step explanation:
A store sells 12-packs of ballpoint pens for $1.09 each and composition books for $2.79 each. Cindy buys m packs of ballpoint pens and n composition books. The store offers a 5% discount for every 50th customer who makes a purchase. If Cindy gets the 5% discount, which expression will represent Cindy’s bill?
A.
0.05 − 1.09m + 2.79n
B.
1.05 + 1.09m + 2.79n
C.
1.05(1.09m + 2.79n)
D.
0.95(1.09m + 2.79n)
Answer:
D
Step-by-step explanation:
100% is 1-
5% is 0.05
1-0.05 = 0.95
0.95(1.09m + 2.79n)
Answer:
d
Step-by-step explanation:
Percy has $70 in a savings account that earns 10% interest, compounded annually. To the nearest cent, how much interest will he earn in 3 years?
Answer:
21 because 10% of 70 is 7 so 7 x 3 is 21
Step-by-step explanation:
Eli wanted to order candy online. Company A is offering 2 1/2 pounds of chocolate for $32.00. How much is Company A charging per pound of chocolate?
A. $12.80 per pound of chocolate
B. $16.25 per pound of chocolate
C. $0.07 per pound of chocolate
D. $15.75 per pound of chocolate
Answer:
A) $12.80 per pound of chocolate
Step-by-step explanation:
As, 2 1/2 pounds = 5/2 = 2.5
So for 2.5 pounds = $32
For 1 pound = 32/2.5 = 12.80
So, = 12.80
Write a real world story problem that would fit this situation
Answer:
what's the situation?????????
