I don't know if i'm right but I think the first question is 5 inches, the second question is 8 inches, the third question is 24 inches because there are three blocks and each are 8 inches so 8 x 3 = 24, and the last question is 45 inches because there are 9 bricks each 5 inches on the top so 9 x 5 = 45. (again I am not sure if this is correct but it is what I think)