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
