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3 years ago

Find the surface area of the pyramid. The side lengths of the base are equal.

Mathematics

2 answers:

Firlakuza [10]3 years ago

8 0

Answer:

189.426

I used a calculator because the formula is complicated.

Sonja [21]3 years ago

3 0

Answer: 32.9 I think?

Step-by-step explanation:

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Solve this linear equation for p.

Fynjy0 [20]

Answer:

11.2

Step-by-step explanation:

divide 160 by 14.3

6 0

3 years ago

Read 2 more answers

Three times the result of subtracting three from eight

MrMuchimi

The answer is 15 i believe

5 0

4 years ago

What is the slope and Y intercept of the equation X=10

xenn [34]

Answer:

Slope is undefined and y int does not exist

Step-by-step explanation:

x=10 means it will be a vertical line where x= 10 so the slope is undefined and since it is perfectly vertical, it will never touch the y axis.

5 0

3 years ago

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with σ = 31.62

AysviL [449]

Answer:

A sample size of at least 737 specimens is required.

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the width 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.

In this problem, we have that:

$M = 3, \sigma = 31.62$

So:

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

$3 = 2.575*\frac{31.62}{\sqrt{n}}$

$3\sqrt{n} = 81.4215$

$\sqrt{n} = 27.1405$

$n = 736.60$

A sample size of at least 737 specimens is required.

6 0

4 years ago

Need help with this problem

ale4655 [162]

Answer:

it's either b or d.

Step-by-step explanation:

I'm not entirely sure, but its one of those.

8 0

3 years ago