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alukav5142 [94]

2 years ago

10

Archeologists found a previously unknown pyramid in Central America, shown in the figure. The media is interested in the volume

of this pyramid. Find the volume of the pyramid.

1 answer:

german2 years ago

4 0

Answer: height of the pyramid is 52 m.

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Three vertices of a rectagle are shown in the grid. What are the coordinates of ththe missing

zmey [24]

Answer:

where is the grid?????................

7 0

2 years ago

A research group needs to determine a 90% confidence interval for the mean repair cost for all car insurance small claims. From

lutik1710 [3]

Answer:

a) $z = 1.645$

b) The should sample at least 293 small claims.

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:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$ , which means that the answer of question a is z = 1.645.

Now, find the margin of error M as such

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

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

(b) If the group wants their estimate to have a maximum error of $12, how many small claims should they sample?

They should sample at least n small claims, in which n is found when

$M = 12, \sigma = 124.88$ . So

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

$12 = 1.645*\frac{124.88}{\sqrt{n}}$

$12\sqrt{n} = 205.43$

$\sqrt{n} = \frac{205.43}{12}$

$\sqrt{n} = 17.12$

$\sqrt{n}^{2} = (17.12)^{2}$

$n = 293$

The should sample at least 293 small claims.

8 0

2 years ago

What is 4 times 31 in distributive property

Aleksandr [31]

Answer:

4(30 +1)= 4(30) + 4(1)

Step-by-step explanation:

The property states a(b+c)= ab+ac.

30 and 1 equals 31, then you just plug the two numbers into the equation.

4 0

2 years ago

List the < from the largest to smallest for ABC

devlian [24]

Answer: B

Step-by-step explanation:

Since $AB < AC < BC$ , it follows that $\angle C < \angle B < \angle A$

4 0

1 year ago

Solve for x<br> (3x + 2)<br> 71<br> A) 28<br> C) 24<br> B) 23<br> D) 34

Sloan [31]

3x=71-2

3x=69

x=69/3

x=23

7 0

2 years ago