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inessss [21]
1 year ago
15

The area of a circle is 616 cm². Find its circumference. Use π = 22/7

Mathematics
1 answer:
kirill [66]1 year ago
7 0

Area = PI x r^2

Circumference = 2 x r x PI

Using area find the radius )r)

616 = 22/7 x r^2

Divide both sides by 22/7:

196 = r^2

Take the square root of both sides:

r = 14 cm

Now find the circumference:

2 x 14 x 22/7 = 88 cm

Answer : A) 88 cm

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3x+5y=-3 x-5y=-5 show your work
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We are given the equations 3x+5y=-3 and x-5y=-5.

Both equations have a 5y  term which allows us to easily solve the system by elimination. To do so we will add the equations together like a simple addition problem by adding the x terms together, the y terms together, and the integer answers together.

3x + 5y = -3
+x - 5y = -5
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4x + 0y = -8

The y terms cancel out since one is positive and one is negative. Now we can solve for x.

4x = -8

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x = -2

Now plug -2 in for x in one of the original equations to find y.

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Step-by-step explanation:

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I=\int\limits^{}_{} \int\limits^{}_D {x*y}  \, dA =  \int\limits^{3}_{0} \int\limits^{3}_{0} {x*y}  \, dx*dy =  \int\limits^{3}_{0} {x}  \, dx\int\limits^{3}_{0} {y}  \, dy  = x^{2} /2*y^{2} /2 =  (3^{2} /2 - 0^{2} /2)* (3^{2} /2 - 0^{2} /2) = 3^{4} /4 = 81/4

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3 years ago
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Answer:

30

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