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professor190 [17]
3 years ago
14

Ive never did anything like this before, Can someone help?

Mathematics
2 answers:
FromTheMoon [43]3 years ago
7 0

Answer:

A

Step-by-step explanation:

SA = πr² + πrs

r = 4.42

s = 2.61

SA = π(4.42)² + π(4.42)(2.61)

SA = 19.5364π + 11.5362π

SA = 61.34 + 36.22

SA = 97.56

The closest answer would be A.

Best of Luck!

Alexandra [31]3 years ago
6 0

Answer:

Its A

Step-by-step explanation:

I also needed help with this, so thanks. The correct answer was A.

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D. It would be less steep.

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Answer:

The p-value of the test is 0 < 0.05, which means that there is significant evidence to conclude that more people utilize the bike lane after the change.

Step-by-step explanation:

Before the upgrade, on any given day, it was known that the section of road saw an average of 350 unique cyclists. Test if more people are using now.

At the null hypothesis, we test if the same number of people is still using, that is, the mean is 350. So

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At the alternate hypothesis, we test if this mean increased, that is:

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t = \frac{X - \mu}{\frac{s}{\sqrt{n}}}

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350 is tested at the null hypothesis:

This means that \mu = 350

After the upgrade, they took a random sample of 35 days in the year and counted the number of unique cyclists each day. The average was 405 cyclists with a standard deviation of 25.

This means that n = 35, X = 405, s = 25.

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P-value of the test and decision:

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Using a t-distribution calculator, this probability is of 0.

The p-value of the test is 0 < 0.05, which means that there is significant evidence to conclude that more people utilize the bike lane after the change.

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