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Otrada [13]
3 years ago
5

Two cars start at a given point and travel in the same direction at average speeds of 45 miles per hour and 52 miles per hour (s

ee figure). How far apart will they be in 4 hours?
Mathematics
1 answer:
Citrus2011 [14]3 years ago
7 0

Answer:

half apart

Step-by-step explanation:

hope it help you

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Intellectual development (Perry) scores were determined for 21 students in a first-year, project-based design course. (Recall th
Anit [1.1K]

Answer:

The 99% confidence interval is (3.0493, 3.4907).

We are 99% sure that the true mean of the students Perry score is in the above interval.

Step-by-step explanation:

Our sample size is 21.

The first step to solve this problem is finding our degrees of freedom, that is, the sample size subtracted by 1. So

df = 21-1 = 20.

Then, we need to subtract one by the confidence level \alpha and divide by 2. So:

\frac{1-0.99}{2} = \frac{0.01}{2} = 0.005

Now, we need our answers from both steps above to find a value T in the t-distribution table. So, with 20 and 0.005 in the two-sided t-distribution table, we have T = 2.528

Now, we find the standard deviation of the sample. This is the division of the standard deviation by the square root of the sample size. So

s = \frac{0.40}{\sqrt{21}} = 0.0873

Now, we multiply T and s

M = 2.528*0.0873 = 0.2207

Then

The lower end of the interval is the mean subtracted by M. So:

L = 3.27 - 0.2207 = 3.0493

The upper end of the interval is the mean added to M. So:

LCL = 3.27 + 0.2207 = 3.4907

The 99% confidence interval is (3.0493, 3.4907).

Interpretation:

We are 99% sure that the true mean of the students Perry score is in the above interval.

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3 years ago
Find the length of the diagonal of a square with perimeter 32.
snow_lady [41]

Answer:

i think A. because she is 4/2

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2 years ago
What is the value of x in the diagram below? If necessary, round your answer
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The answer might be c
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The last one.

Step-by-step explanation:

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2 years ago
A what is an equation stating that two ratios or rates are equal
frozen [14]
The equation is
(A ≠ B)
A is the first number, ratio, rate, etc. , and B is the second.
The ≠ symbol means "does not equal", so the equation means:
[ Ratio A  is NOT equal to  Ratio B. ]



8 0
3 years ago
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