The percent of concentration of a certain drug in the bloodstream 3: hr after the drug is administered is given by K(x) = J! x3+3b' How long after the drug has been administered is the concentration a maximum? Round answer to the nearest tenth, if necessary. Answer: Find the number of units, x, that produces the maximum profit P, if C(x) = 20 + 52x and p =722x. Answer: : The number of books in a small library increases at a rate according to the function 13 {t} = 37090.05 t, Where t is measured in years after the library opens. How many books will the library have 10 year(s) after opening