Hello! I took an exam awhile back and missed two questions but have no feedback describing what went wrong. Let me know what you think. 1. The problem statement, all variables and given/known data Derivative of x / 1 - x Second derivative of -1/3x 2. The attempt at a solution My answer for 1 was the number - (1)(1-x) - (x)(-1) / (1-x)^2 1-x / (1-x)^2 - Cancel leaving x/1-x x / -x = -1 -1 / 1 = -1 --- Second problem: f''(x) -1/3x -1/3x = -3x^-1 f'(x) = (-1)(-3x)^-2 = 1/3x^2 f''(x) = (-2)(3x)^-3 = 1/-6x^3 These two problems are incorrect, I'm not sure why.