1. The problem statement, all variables and given/known data http://img62.imageshack.us/img62/7677/30639229.jpg [Broken] 2. Relevant equations y = sin k x 3. The attempt at a solution Looking for help with part 12b in particular so i can try 13c Im not quite sure how the coefficent of x (K) in the function y=sin kx relate to peroid and frequency. I know that if k is less then 1 the graph is stretched horizontally and if k > 1 its compressed horizontally but i cant come up with the equation.