If f(x) = 2x - 6 and g(x) = 3x + 9, find (f+g)(x)a. (f+g)(x) = 5x + 3b. (f+g)(x) = 5x + 15c. (f+g)(x) = x + 15d. (f+g)(x) = -x - 15

Apyramid fits exactly inside a cube. the cube and the pyramid share the same square base, and they are both exactly the same height. the volume of the cube is 66 cubic inches. what is the volume of the pyramid? explain your answer. answer asap

Ineed here’s a picture of the question

Can anyone explain to me how to do this? anything will .