Find f'(x) for the following function. Then find f'(9), f (0), and f'( - 6) f(x) = 3x + 11x f'(x) = Select the correct choice below and fill in the answer box within your choice, if needed O A. '(9) = (Simplify your answer, if needed) OB. The answer is not a real number. O C. The answer is undefined. XF Select the correct choice below and fill in the answer box within your choice, if needed O A. f'(0) = (Simplify your answer.) SOB. The answer is not a real number. O C. The answer is undefined. dif Select the correct choice below and fill in the answer box within your choice, if needed. dif O A. f'(-6) = (Simplify your answer.) rat