I need help with these question I failed in class yesterday I need to see what I did wrong

9. The equation pr} = 5p2 + Ill-Up models the revenue R as a function of the price p [in dollars) of a product. What price p will maximize the revenue? What is the maximum revenue? - .A restaurant manager wants to purchase 200 sets of dishes. One design costs $25 per set, while another costs $45 per set. If she wants to use her entire budget of W500, how man}r of each design should he ordered? See me if you can't come up with the equations: don't leave this problem blank] - l 1. Refer to the graph next to this problem to write f (I) the equation of a polynomial function that might have the given graph. (It may help you to write the zeros and their multiplicit},r in the spaee below). {10pm} 12. Your function has an even degree and negative leading coefficient. Which of the following graphs could represent your function? a. b. d. 13. Find the complex zeros of the polynomial function f (x) = x3 + 3x2 + 4x + 12. A partial graph is given below15. Solve the inequality for f(x)