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3 years ago

If the radius of a circle with a area of 5.3 mm squared is multiplied by 5,

1 answer:

6 0

I'm guessing the question is meant to be "<span>If the radius of a circle with a area of 5.3 mm squared is multiplied by 5, what will the new area be?", so i'll answer that.

Area of a circle =</span>πr^2

5.3=πr^2, 5.3=π(5r)^2
132.5=25πr^2

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Which set of measurements forms a right triangle? Use the Pythagorean theorem: a2 + b2 = c2.

user100 [1]

Answer:

A. 15, 20, 25.

Step-by-step explanation:

25^2 = 625

20^2 = 400

15^2 = 225.

Now 625 = 400 + 225 = 625 so it is choice A.

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3 years ago

After choir practice, Jamal and Bettina shared a pizza that was cut into 10 equal slices. Jamal ate 1/2 of the pizza, and Bettin

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Answer:

C 70%

Step-by-step explanation:

It is 70% because you are see what is it all together and so its 70%

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2 years ago

450 high school freshmen were randomly selected for a national survey. Among survey participants, the mean grade-point average (

umka21 [38]

Answer:

The margin of error is of 0.01.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.7}{2} = 0.15$

Now, we have to find z in the Z-table as such z has a p-value of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.15 = 0.85$ , so Z = 1.037.

The margin of error is of:

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

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

Standard deviation was 0.21.

This means that $\sigma = 0.21$

Sample of 450:

This means that $n = 450$

What is the margin of error, assuming a 70% confidence level, to the nearest hundredth?

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

$M = 1.037\frac{0.21}{\sqrt{450}}$

$M = 0.01$

The margin of error is of 0.01.

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3 years ago

Rita and Tina each make $11 an hour working as cashiers at a supermarket. Last week, Rita worked r hours while Tina worked t hou

Sonbull [250]

Rita = (11r + 32)
Tina = 11t

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3 years ago

HELP ASAP!!!! PLSS!!!

Ne4ueva [31]

Answer:

9/32

Step-by-step explanation:

3/4 of 3/8 is 0.28125 or 9/32

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3 years ago

Read 2 more answers