Question

What is the volume of a cube with side length 9 feet?

A. fifty-four cubic feet

B.eighty-one cubic feet

C. four hundred eighty-six cubic feet

D. seven hundred twenty-nine cubic feet

Answer 1

seven hundred twenty nine cubic feet.

Here's the theory behind it: if side of a cube is a, the volume is a^3.
Here, a being 9 feet, volume is 9^3=729 cubic feet.

Answer 2

\[V=L ^{3}\]
V=Volume
l=ength