[-/5 Points] DETAILS Use the function below to answer the questions. f(x) = 7x1/7 - x (a) Find f'(x) = (b) Find the x values of all of the critical points. Enter your answers as a comma separated list. X = (c) Find the global maximum and global minimum on the interval -1 s x s 5. global maximum at x = global minimum at x = 3. [-/3 Points] DETAILS the function below to answer the following questions.3. [-/3 Points] DETAILS Use the function below to answer the following questions. f(x) = x - 18In(x + 7) on the interval 0