1. The problem statement, all variables and given/known data http://img121.imageshack.us/img121/8907/graphr.jpg [Broken] 2. Relevant equations 3. The attempt at a solution i cant believe i got this wrong.. i even checked the textbook for that and still got it wrong :/ B,C,D,E are 100% correct. the other 2 i logically matched them.. increment of x obviously gonna be F and the tangent line, or the differentiable of y is A so whats wrong?