Can y’all help me on question 35?!

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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?

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol