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Novay_Z [31]
3 years ago
12

The surface area of a sphere is found using the formula , where r is the radius. If the surface area of a sphere is 64 square fe

et, what is the radius, in feet? A. –4 B. 16 C. 4 D. –16
Mathematics
1 answer:
Nadusha1986 [10]3 years ago
8 0

Answer:

It should be C,  I believe?

Step-by-step explanation:

The surface area of a sphere can be found by the formula: A=4πr²

If the area is 64 square feet.  -----> square feet means doubled

A=64² = 4096 feet

4096 =4πr²   (divide 4π on both sides)

4096 ÷4π = 1024π

1024π = r²  (square root r on both sides)

r = 56.718523229


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3 years ago
The area of a rectangular playground is 16 square yards. The length of the playground is 4 times longer than
Alexxandr [17]

length = 8 yd and width = 2 yd

So, Option D is correct.  

Step-by-step explanation:

Area of rectangular playground = 16 square yards

Width of playground = w

Length of playground = l = 4w

We need to find length(l) and width(w)

The formula used is:

Area = Length * Width

Putting values:

Area = Length * Width\\16=4w*w\\16=4w^2\\w^2=\frac{16}{4}\\w^2=4\\Taking\,\,square\,\,root:\\\sqrt{w^2}=\sqrt{4}\\ w=\pm 2

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So. Width = 2

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Hence, length = 8 yd and width = 2 yd

So, Option D is correct.  

Keywords: Area of rectangle

Learn more about Area of rectangle at:

  • brainly.com/question/4054269
  • brainly.com/question/4459688
  • brainly.com/question/6564657

#learnwithBrainly

3 0
3 years ago
Charlene had 5,750 pieces of penny candy. She sold 3/5 of them and divided rest into 5 equal bags to give her friends for Hallow
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2 years ago
Which ordered pair is a solution of the equation?<br> -4r +7= 2y - 3
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Answer:

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kkurt [141]

Andre : Anything less than -100, for example -150

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Han: Anything between -100 & 100, for example 50

50> 100

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8 0
3 years ago
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