. Question 4 Let f(ac) = 2 + 3x - 240x + 9. (a) Use the definition of a derivative or the derivative rules to find f' (a) = (b) Use the definition of a derivative or the derivative rules to find f''(x) = (c) On what interval is f concave downward ? (d) On what interval is f concave upward ? (e) State the x-value of any inflection point(s)? X = > Next Question. Question 5 Below is the function f(x). -7 6 -5 -4 -3 -1 3 4 5 6 Over which interval of a values is f' > 0? O ( - 4, 00) O [ - 4, 00) O ( - 00, - 4) O ( - 00, - 4] O ( - 00, 00 Over which interval of a values is f' 0? O ( - 4, 00) O [ - 4, 00) O ( - 00, - 4) O ( - 00, - 4) O ( - 00, 00) Over which interval of a values is f' 0) O concave down (f"' Next QuestionIQuestionE 1-H