Find the volume for a sphere with a diameter of 20 feet. Round to the nearest whole number.

Use the formula, 4/3 * pi * r^3

The radius of the sphere is half the diameter, so r = 10 feet.

Plugging this into the formula:

V = 4/3 * pi * r^3
V = 4/3 * pi * 10^3
V = 4/3 * pi * 1000
V = 4,188.79

Rounding to the nearest whole number:

V = 4,189

Therefore, the volume of the sphere is approximately 4,189 cubic feet.