Find the intervals on which the graph of f is concave upward, the intervals on which the graph off is concave downward, and the inection points. f(x) = x22 + 4x2 (:> 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. {9} A. E (Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as needed.) if} B. The graph is never concave upward. 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)= x'3 +24x524x+ 19 E 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. If '3 A. (Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as needed.) if} B. The graph is never concave upward. 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 = 1764 - 0.12x2 0