What would you do first: distribute a coefficient over every term in parentheses or combine like terms in parentheses? why?

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?

What is the value of f(x) = 2.2 for f(-2)?

Tell whether the two rates form a proportion