Pls help me im actually crying rn

Which of the following expressions is equal to 2x^2+8

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?

How do you write a paragraph proof to prove that the corresponding angles shown are congruent