Solve this and explain how you gotn/8-29=7

Which of the following are accepted without proof in a logical system? check all that apply.

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?

The quadratic function h(t)=-16.1t^2+150 choose the graph representation