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3 years ago

Landon is building new bookshelves for his bookstore's new mystery section. Each shelf can hold 34

Mathematics

1 answer:

kicyunya [14]3 years ago

3 0

Answer:

39 shelves needed to build

Step-by-step explanation:

To find the number of shelves needed we need to divide the number of mystery books by 34

We know that. Each shelf can hold 34.

It is given that, There are 1,326 mystery books

So, 1,326/34

39 shelves needed to build

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A rectangular playground measure 200m by 100m .caculate the area in square kilometers here is a tip when you have calculated the

Rainbow [258]

Area of a rectangle = L * W
200 * 100 = 20,000
= 20,000m^2
Convert that to km^2
= 0.02km^2

6 0

2 years ago

A ladder leans against a building that angle of elevation of the latter is 70° the top of the ladder is 25 feet from the ground.

VashaNatasha [74]

Answer:

a. 20.5

Step-by-step explanation:

because this will form a right triangle we can use tan (opposite over adjacent) so an equation we could set up would be tan(70)=25/x

therefore we can just solve the equation which would give us 20.45. so if we round it the answer would be a

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3 years ago

Read 2 more answers

Which of the following is an irrational number?

Ad libitum [116K]

Answer:

sq root of 26

Step-by-step explanation:

One rule of an irrational number is that it cannot be written as an whole fraction, since the other two are fractions, the last must be irrational.

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2 years ago

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A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while

ki77a [65]

Answer:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

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

$\mu$ population mean (variable of interest)

$\sigma=12$ represent the population standard deviation

n represent the sample size

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

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

And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

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

The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=1-0.96 =0.04$ . And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got $z_{\alpha/2}=2.054$ , replacing into formula (b) we got:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

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3 years ago

How do you do this? I'm confused! Thanks for your time and effort!!!

Alenkinab [10]

L=k/r^2,
r^2 is the denominator cause L varies inversely with the square of distance
The answer is B

3 0

3 years ago