What is the answer to a/b=c for b

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?

Which statement explains the relationship between corresponding terms in the table?

Which statement is true about the discontinuities of the function f(x) = x-5/ 3x^2-17x-28