Hey I've been lurking on this forum all day trying to find answers / help to problems I can't solve in my calculus text. So I finally got the bright idea to make an account and ask questions :) Although first I want to mention that I'm very rusty in math so I may need the special step by step for dummies aid :p Ok I'm the beginning chapters of this textbook so this will mostly be easy stuff that I'm having trouble completing The problem is: Let S(x) = X^2, Let P(x) = 2^x, let s(x) = sin x. Find each of the following. In each case your answer should be a number. these are the two parts I need help on i) (S o P)(y) iii) (S o P o s)(t) + (s o P)(t) For (S o P)(y) I know: (S o P)(y) = S(P(y) = S(2^x(y)) = x^2(2^x(y)), but on the back of the book the answer is 2^2y I'm not sure how the author derived this answer. could someone maybe explain this and the otherone step by step so maybe I can under stand it?