The annual snowfall amount for a ski resort is 15 feet less than the previous year. what is the absolute value, in feet, of the change in snowfall amount from last year to this year?

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?