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SVEN [57.7K]
3 years ago
9

A compact disc has an approximate Radius of 2 3/8 inches, what is the approximate area of a CD

Mathematics
1 answer:
professor190 [17]3 years ago
6 0

Answer:

A≈12.57      

r Radius 2

Step-by-step explanation:

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I have trouble with these two questions, even i did my equation but i don’t get the answers
Sophie [7]

Answer:

$318.17, out of state college is $161.12 cheaper per month

Step-by-step explanation:

72*24 = 1728 + 410*4 = 1728 + 1640 = 3368 + 450 = 18/12 = $318.17

8700+650*9 = 8700 + 5850 = 14550/9 = 1616.66

8500+400*9 = 8500 + 3600 = 12100 + 1000 = 13100/9 = 1455.56

1616.67 - 1455.56= $161.11 (use $161.12)

3 0
3 years ago
The bottem half is the answers help pls for big brainnnnnn
vlabodo [156]

Answer:

C

Step-by-step explanation:

11 times 4 is 44 plus 5 is 49

4 0
3 years ago
Read 2 more answers
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
Find the slope of the line (12,-18), (11,12)
telo118 [61]

Answer:

-30

Step-by-step explanation:

To find slope, subtract two y's and then subtract the x's in the same order.

<u>12-(-18)</u>=<u>30</u>=-30

11-12       -1

You could also switch the order like this...

<u>-18-12</u>=<u>-30</u>=-30

12-11      1

As you can see, both of the ways of solving for slope resulted in -30.

Hope this helps!! Have a great day :3

4 0
3 years ago
Can a triangle be drawn with the following angle measures? 45, 55, 65
shtirl [24]
No because a triangle is 180 degrees and the following angles only equal to 165
4 0
3 years ago
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