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3 years ago

9

Sam earned $154 washing 7 cars. He earned the same amount for washing each car. Select all the equations that show reasonable es

timates for the amount Sam earned washing each car.

2 answers:

Vitek1552 [10]3 years ago

8 0

Answer:

154÷7=22

Step-by-step explanation:

If Sam earned $154 for 7 cars then you can divide 154 by seven and get an answer of 22.

gogolik [260]3 years ago

5 0

Answer:

Put the equations and I can answer

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3 years ago

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3 years ago

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saul85 [17]

Answer:

78.5

Step-by-step explanation:

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2 years ago

The Wall Street Journal reported that automobile crashes cost the United States $162 billion annually (2008 data). The average c

ivanzaharov [21]

Answer:

$n=(\frac{2.326(500)}{120})^2 =93.928 \approx 94$

So the answer for this case would be n=94 rounded up to the nearest integer

Step-by-step explanation:

Information given

$\bar X$ represent the sample mean

$\mu$ population mean (variable of interest)

$\sigma= 500$ represent the population standard deviation

n represent the sample size

Solution to the problem

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{s}{\sqrt{n}}$ (a)

And on this case we have that ME =120 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The confidence2 level is 98% or 0.98 then the significance level would be $\alpha=1-0.98=0.02$ and $\alpha/2=0.01$ , the critical value for this case would be $z_{\alpha/2}=2.326$ , replacing into formula (b) we got:

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3 years ago

Which is not equivalent 1/5 7/35 6/25

Reptile [31]

Find a common denominator...

1/5 = 7/35
7/35 = 7/35
6/25 = ... can't have 35 as a denominator. Not equivalent.

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2 years ago