Question 1 Score on last try: 0.5 of 1 pts. See Details for more. > Next question Get a similar question You can retry this question below Let f(x) = 6x* + 917. (a) Use the definition of a derivative or the derivative rules to find f'(x) 18x' + 63x (b) Use the definition of a derivative or the derivative rules to find f" (I) = 336x + 378x (c) On what interval is f increasing? Increasing 21 16 .00 X (d) On what interval is f decreasing? Decreasing: 21 (e) On what interval is f concave downward? Concave Down: (-3:0 (f) On what interval is f concave upward? Concave Up: XQuestion 2 The cost, in dollars, to produce a designer dog leashes is C(x) = 3x + 2, and the revenue function, in dollars, is R(x) = -2x- + 55x Find the profit function. P(I) Find the number of leashes which need to be sold to maximize the profit. Select an answer v Find the maximum profit. Select an answer v Find the price to charge per leash to maximize profit. Select an answer v What would be the best reasons to either pay or not pay that much for a leash