Question

I need help the volume of a sphere is

Answer 1

$V=36\pi\ ft^3\\\\V=\dfrac{4}{3}\pi r^3\\\Downarrow\\\\\dfrac{4}{3}\pi r^3=36\pi\ \ \ |:\pi\\\\\dfrac{4}{3}r^3=36\ \ \ |\cdot3\\\\4r^3=108\ \ \ \ |:4\\\\r^3=27\to r=\sqrt[3]{27}\to r=3\ ft$

Answer: The radius r = 3 ft.