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3 years ago

Look at this prism and its net what is the surface area of this rectangular prism?

Mathematics

2 answers:

natali 33 [55]3 years ago

5 0

Answer:idk

Step-by-step explanation:

and ur homeschooled 2 with k12

tia_tia [17]3 years ago

4 0

To solve these, I like to write it out in expanded form for each rectangle.

Starting from left to right:

(12*7)+(12*5)+(12*7)+(7*5)+(12*5)+(7*5)

It can also be written as:

2(12*7)+2(12*5)+2(7*5)

This equals 358cm^2

It is squared because it is a result of multiplying 2 dimensions: length*width.

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Find the unknown measures. Round lengths to the nearest hundredth and angle measures to the nearest degree.

MatroZZZ [7]

The answer is AB= 4.62; mA= 22; mB=68
You could quickly find the answer by just using Pythagorean theorem to find AB.
4.3^2 +1.7^2 = AB^2

5 0

3 years ago

The head librarian at the Library of Congress has asked her assistant for an interval estimate of the mean number of books check

Verdich [7]

Answer:

$n=(\frac{1.960(150)}{90})^2 =10.67 \approx 11$

So the answer for this case would be n=11 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma =150$ represent the population standard deviation

n represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The confidence interval for this case is given by: (740, 920)

We can find the estimate for the mean and we got:

$\bar X = \frac{740+920}{2} = 830$

and the margin of error is given by :

$ME = \frac{920-740}{2}= 90$

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{s}{\sqrt{n}}$ (a)

And on this case we have that ME =90 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} s}{ME})^2$ (b)

The critical value for 95% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.025;0;1)", and we got $z_{\alpha/2}=1.960$ , replacing into formula (b) we got:

$n=(\frac{1.960(150)}{90})^2 =10.67 \approx 11$

So the answer for this case would be n=11 rounded up to the nearest integer

5 0

3 years ago

PLSSS HELP MEEEEEEEEE

Tpy6a [65]

2^3:
a) 2 x 2 x 2
b) 8

3^2 x e^3:
a) 3 x 3 x e x e x e
b) 9e^3

6 0

3 years ago

Read 2 more answers

3 days converted to seconds

Aleksandr [31]

259,200 seconds!!

hope this helps :)

8 0

3 years ago

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Brian is solving the equation x^2 - 3/4 x = 5. What value must be added to both sides of the equations to make the left side a p

Arturiano [62]

I believe I answered your other question like this.

Just write the equation like:
x^2 - 3/4 x - 5 and follow the same process that I listed out before

7 0

3 years ago