Find the indicated derivative for the function. f"(x) for f(x) = 4x - 6x3 + 9x - 9 f'' ( x ) =Find the intervals on which the graph off is concave upward, the intervals on which the graph of f is concave downward, and the inection points. f(x) = x4 + 36x3 36x+ 7 <:> For what interval(s) of x is the graph of f concave upward? Select the correct choice below and, if necessary. ll in the answer box to complete your choice. A. (Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as needed.) {:3 B. The graph is never concave upward. For what interval(s) of x is the graph of f concave downward? Select the correct choice below and, if necessary. fill in the answer box to complete your choice. 1:: j:- A. (Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as needed.) '12:} B. The graph is never concave downward. Determine the x coordinates of any inection points of the graph of f(x). Select the correct choice below and, if necessary, ll in the answer box to complete your choice. (3;. A. x = (Type an exact answer. Use a comma to separate answers as needed.) (3;. B. There are no inection points. The marketing research department of a computer company used a large city to test market the firm's new laptop. The department found the relationship between price p (dollars per unit) and the demand x (units per week) was given approximately by the following equation. p = 1200 - 0.16x 0