How do i find the volume of a rectangular pyramid?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

Write the rational number in lowest terms 99/-15

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion