This is a number between zero and one expressed as one number over another

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?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2

Jane has 5 nickels.john has 3 dimes.jane says she has a greater amount of money.with the information given,is she correct?