If the volume of a sphere is 400 pi in^3, what is it’s radius ?

Answer 1

V= (4/3)pi(r^3) = 400pi

cancel the pi on both sides to get

(4/3)r^3 = 400

r^3 = (3/4)400 = 300

r = cube root of 300 = about 6.69 inches

You need a calculator, maybe a scientific one with more than just square root functions