Answers!
This is the kind of game that I can play.
1) Considering the surface area is 2piRH. For the outside of the pipe, R is 4 and H is 5, so SA=40pi. For the inside, R is 3 instead, so the answer is 30pi. Add the two together 30pi+40pi= 70pi. And since SA=kn, where n=pi, you divide the...