All categories

2 years ago

BRAINLIESTT ASAP! PLEASE HELP ME :)

Mathematics

2 answers:

myrzilka [38]2 years ago

7 0

Circumference is 25.13
area is 50.27

spin [16.1K]2 years ago

6 0

<h3>Answers:</h3><h3>Exact area = 16pi square meters</h3><h3>Exact circumference = 8pi meters</h3>

Note how the units are not the same for each. The area involves square units while the circumference is a linear unit.

==========================================================

Work Shown:

d = 8 is the diameter

r = d/2 = 8/2 = 4 is the radius

A = area of circle

A = pi*r^2

A = pi*4^2

A = pi*16

A = 16pi

---------

C = circumference of the circle

C = pi*d

C = pi*8

C = 8pi

Alternatively,

C = 2*pi*r

C = 2*pi*4

C = 2*4*pi

C = 8pi

You might be interested in

perform the translation of triangle ABC according to the vector DR. Find the coordinates of the image.

belka [17]

I think that the answer for that one is A

5 0

2 years ago

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

5 0

3 years ago

3) (7,5), (9,-4)<br> A) (-1, 4.5)<br> G) (6, 2.5)<br> B) (11.-13)<br> D) (8,0.5)

Mnenie [13.5K]

Answer:

Step-by-step explanation: 474747-4747474-

6 0

2 years ago

What value of x makes the equation 6x + 12 = 42 true?

Naddika [18.5K]

Answer:X=5

Step-by-step explanation:

6x + 12 = 42

-12. -12

6x=30

6x. 6

X=5

Check

6(5)+12=42

30+12

8 0

3 years ago

Read 2 more answers

The difference between a frequency histogram and a relative frequency histogram is that the relative frequency histogram indicat

Ede4ka [16]

Answer: d. percentage of observations on the vertical (y) axis, whereas a frequency histogram indicates counts.

Step-by-step explanation:

A frequency histogram is a graph showing the frequency for the occurrence of an outcome in a data set. A frequency histogram is used to organize data thereby making the data easy to comprehend.

A frequency histogram is a graph that shows how the number of times a particular thing happens, and this is shown in percentages.

Fir an histogram, the horizontal axis is a number line that contains classes of uniform length while the frequency or count is represented on the vertical axis.

The difference between a frequency histogram and a relative frequency histogram is that the relative frequency histogram indicates percentage of observations on the vertical (y) axis, whereas a frequency histogram indicates counts.

Therefore, option d is correct.

6 0

2 years ago