Please show work on numbers nine and ten.

Problem 9: Find the critical numbers of f. What does the Second Derivative Test tell you about the behavior of f at these critical numbers? What doest the First Derivative Test tell you? Problem 10: A drug response curve describes the level of medication in the bloodstream after a drug is administered. A surge function S(t) = Are * is often used to model the response curve, reflecting an initial surge in the drug level and then a more gradual decline. If, for a particular drug A = 0.01, p = 4, & = 0.07, and t is measured in minutes, estimate the time corresponding to the inflection points and explain their significance. Using Desmos graph the drug response curve and mark on the graph the inflection points