3 Questions. Volumes of solids of revolution, arc length, areas of surfaces of revolution.Please do not type the work. I can not recognize what you do. There are a lot of fallacies to use math marks.

Problem 1. For the following two curves, find dy and i y. For which values of t is the curve concave upward? (a): 1=1-Int y=t+Int (b): I = cos(t) y = sin(2t) 0