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2 years ago

Please help with #8 !!

Mathematics

2 answers:

Sophie [7]2 years ago

7 0

That would be 6.64 / 1.35 = 4.9 times (to the nearest tenth.)

Korvikt [17]2 years ago

3 0

6.64/1.35= 4.91 thousand miles. nearest is 4.9 thousand miles

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sergeinik [125]

Isaiah will mow 9 lawns in 3 hours at the given rate.

Step-by-step explanation:

Given,

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Keywords: unit rate, fraction

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3 years ago

8. 6r + 5 = 4 6 - 7y -20

Rudiy27

Answer: r=-7/6y+7/2

Step-by-step explanation:

Step 1: Add -5 to both sides.

6r+5+−5=−7y+26+−5

6r=−7y+21

Step 2: Divide both sides by 6.

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2 years ago

What’s the are of a trapezoid

kozerog [31]

I need to know the question that tells us what the other parts are.

5 0

3 years ago

You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

svetoff [14.1K]

Answer:

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So the answer for this case would be n=2663 rounded up to the nearest integer

Step-by-step explanation:

We have the following info:

$ME = 50$ margin of error desired

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The margin of error is given by this formula:

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

And on this case we have that ME =50 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 critical value for 99% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=0.01$ . And for this case would be $z_{\alpha/2}=2.58$ , replacing into formula (b) we got:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

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2 years ago

Bingel [31]

Answer:

use lecture notes

Step-by-step explanation:

4 0

2 years ago