Question

What is the volume of a sphere with a radius of nine units

Answer 1

The correct answer is 972π units^3

Answer 2

The volume formula for a sphere is $V=\frac{4}{3}\pi r^3$. If the radius is 9 units, we make the replacement accordingly. $V=\frac{4}{3}\pi (9)^3$. 9 cubed is 729, so the formula now is $V=\frac{4}{3}\pi (729)$. Multiplying 729 by 4 and then dividing by 3 gives us the volume, in terms of pi, to be $V=972\pi units^3$