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alexdok [17]
3 years ago
8

A circle has a radius of 2.5 and a diameter of 5 what is the area and circumference of the circle​

Mathematics
1 answer:
Ivahew [28]3 years ago
4 0

Answer:

Circumference: 15.71

Area: 19.63

Step-by-step explanation:

<u>Circumference:</u>

Multiply diameter by π/pi (≈3.14)

5 • π = 15.7079632679

Round the answer to the nearest Hundreths place

15.7079632679  ≈ 15.71

<u>Area:</u>

Square value of the radius of the circle

2.5² = 6.25

Multiply 6.25 by pi

6.25 • π = 19.6349540849

Round the answer to the nearest hundreth

19.6349540849 ≈ 19.63

Answer is

Circumference: 15.71

Area: 19.63

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Even, positive, prime number I think that’s it
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3 years ago
-5x + 3y = -8<br> 3x - 7y= -3
AnnZ [28]

Answer:

x = 5/2   y = 3/2

Step-by-step explanation:

You need to write what the question is besides the information in the problem.  I assume the question is to find the values of x and y.

Going on that premise, Let equation (1)   be -5x + 3y = -8 and

equation (2)  be 3x - 7y = -3

Lets multiply (1) by 3 and (2) by 5 and we get equations (4) and (5)

(4)   -15x + 9y = -24    and  (5)    15x - 35y = -15  Now add (4) and (5)

-15x + 9y = -24

<u> 15x - 35y = -15</u>

      -26y = - 39

y = 3/2     Now substitute y = 3/2 in equation (1).  -5x + 3)(3/2) = -8

                                                                                 -5x + 9/2 = -8

                                                                                  -10x + 9 = -16

                                                                                  -10x = -25

                                                                                      x = -25/-10 = 5/2  

x = 5/2   y = 3/2

Check:  Substitute your answers into equation (2) and see if they work.

3(5/2) -7(3/2) = 15/2 - 21/2 = -6/2 = -3   Hooray!  We have the correct values for x and y that makes each equation true  

8 0
3 years ago
Use technology and the given confidence level and sample data to find the confidence interval for the population mean muμ. assum
nikitadnepr [17]

The given in this problem are:

99% confidence level

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Mean = 2.0 kg

Standard deviation = 4.8

Z value for a 9% confidence interval is 2.576

 

Confidence Interval = mean ± Z s/ sqrt n

= 2.0 ± 2.576(4.8/sqrt 61)

=2.0 ± 2.576 (0.6145770236779006736364371988794)

= 2.0 ± 1.5832

<span>= 0.4168 < x < 3.5832</span>

4 0
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Shawn has two investments which both are compounded annually. Investment x earns 5% interest, and investment y earns 7% interest
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Answer:

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6 0
3 years ago
The table lists recommended amounts of food to order for 25 party guests. Amanda and Syndey are hosting a graduation party for 4
yan [13]

Answer:

Answer: 25 guests is 2.5 times more than 10

Multiply each order by 2.5

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Buns = 1 x 2.5 = 2.5, round to 3

Potato salad = 2 x 2.5 = 5

Step-by-step explanation:

7 0
3 years ago
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