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3 years ago

on a road trip, the Morgan family traveled 408 miles in 6 hours, how many miles did the family travel in 4 1/2 hours?

Mathematics

1 answer:

Radda [10]3 years ago

8 0

Find miles per hour by dividing total miles by total time:

408 / 6 = 68 miles per hour

Now multiply miles per hour by time:

68 x 4 1/2 = 306 miles

Answer: 306 miles

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katovenus [111]

Answer: 1078m^2

Step-by-step explanation:

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3 years ago

What is b^2 = 49 on khan academy

pogonyaev

Answer:

b=7

Step-by-step explanation:

7 squared is 49, so b equals 7. I hope that was what you were looking for, and that it helps.

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3 years ago

How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the populati

marshall27 [118]

Using the z-distribution, it is found that a sample of 171 should be selected.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

The margin of error is:

$M = z\frac{\sigma}{\sqrt{n}}$

In which:

$\overline{x}$ is the sample mean.

z is the critical value.

n is the sample size.

$\sigma$ is the standard deviation for the population.

For this problem, the parameters are:

$z = 1.96, \sigma = 40, M = 6$

Hence we solve for n to find the needed sample size.

$M = z\frac{\sigma}{\sqrt{n}}$

$6 = 1.96\frac{40}{\sqrt{n}}$

$6\sqrt{n} = 40 \times 1.96$

$\sqrt{n} = \frac{40 \times 1.96}{6}$

$(\sqrt{n})^2 = \left(\frac{40 \times 1.96}{6}\right)^2$

n = 170.7.

Rounding up, a sample of 171 should be selected.

More can be learned about the z-distribution at brainly.com/question/25890103

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2 years ago

During a sale, a dress is marked down form a selling price of $90 to a sale price of $81. What is the percent of markdown?

Alex_Xolod [135]

The percent of the mark down would be 10%. If you subtract 81 from 90, you get 9. Then divide 90 by 9 and you get 10. Hope this helps!

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3 years ago

Please help!!!!! Will mark brainiest!!!!!

Tasya [4]

You pay off the bigger one first because if you don't do that one first the amount of money in the credit card will just gain interest and have more, and you won't be able to pay the big amount.

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3 years ago