Can someone please answer my three math questions I’ll give u five stars I rlly need them thanks if u need the link for the questions I’ll give them to u

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?

If you could answer these your a life saver

In a column proof the right column states your reasons