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 feet, what is the radius, in feet? a. –4 b. 16 c. 4 d. –16

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

the terms of a geometric sequence can be found by beginning with the first term and multiplying by the common ratio repeatedly. a recursive formula for a geometric sequence with common ratio r is given by an=ran−1 a n = r a n − 1 for n≥2 n ≥ 2 .

step-by-step explanation: