2/3 - 1/m

Please, simplify the algebraic terms

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?

Aline passes through 3,7 and 6,9 what equation represents the line

At 6 1/2 cents per pound of string beans how much does 7 pounds cost