Problem 7. (30=20+10pts) Suppose after being administered a drug for anesthesia, the concentration of the drug in the bloodstream can be modeled by 5t (t + 2)(t + 4) where f (t) is the concentration of the drug in the bloodstream after it time. N) = (1) On what interval is the concentration of the drug increasing? And on what interval is the concentration of the drug decreasing? (2) What is the maximum concentration of the drug in the bloodstream