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NeX [460]
3 years ago
13

The length of a page in a yearbook is 7 inches. The top margin is 1/2 inch, and the bottom margin in 3/4 inch. What is the lengt

h of the page inside the margins?
Mathematics
1 answer:
Andrei [34K]3 years ago
7 0
Can you be more specific?
 
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Marisa has $40 in her savings account and plans to save $x each month for 5 months. The expression $5x + $40 represents the tota
postnew [5]
Do you want me to write it in paper or just explain it to you
8 0
2 years ago
What is the solution to the system of equations?<br> y =2/3 x + 3<br> x = -2
Kitty [74]

Answer:

The answer is 5/3

Step-by-step explanation:

hope this helped

5 0
2 years ago
A study reported that the average age of menarche of girls entering the first year class of a small American private college in
Verizon [17]

Answer:

Null hypothesis: \mu = 11.89

Alternative hypothesis: \mu \neq 11.89

And we want to test this with a confidence interval:

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

After conduct the interval of 95% for the true mean we got: (11.59, 13.31)

And for this case the confidence interval contains the value of 11.89, so then we have enough evidence to FAIL to reject the null hypothesis at 5% of significance that the true mean is 11.89.

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=12.98 represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n=30 represent the sample size  

Solution to the problem

For this case we want to test the following hypothesis:

Null hypothesis: \mu = 11.89

Alternative hypothesis: \mu \neq 11.89

And we want to test this with a confidence interval:

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

After conduct the interval of 95% for the true mean we got: (11.59, 13.31)

And for this case the confidence interval contains the value of 11.89, so then we have enough evidence to FAIL to reject the null hypothesis at 5% of significance that the true mean is 11.89.

4 0
3 years ago
Can someone please answer. There is one problem. There is a picture. Thank you!
Troyanec [42]
Surface area of sphere = 4πr²

<span>4πr² = 314.16
</span>
r² = 314.16/(4π)

r² ≈ 25.0000

r ≈ √<span>25.0000

r </span>≈ 5

Radius is almost 5 ft.
7 0
3 years ago
Angelo rode his bike around a bike trail that was 1/4 of a mile long. He rode his bike around the trail 8 times. Angelo says he
coldgirl [10]
They are both correct it's just that the say it differently 8/4 IS 2 so yea. I'm a middle schooler.
5 0
3 years ago
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