3.0x The percent of concentration of a certain drug in the bloodstream x hr after the drug is administered is given by K(x) = x +64 drug has been administered is the concentration a maximum? Round answer to the nearest tenth, if necessary. A. 3.0 hr OB. 3.2 hr tempted 3.0 hr *** How long after the

The percent of concentration of a certain drug in the bloodstream x hr after the drug is administered is given by K(x)=x2+643.0x. How long after the drug has been administered is the concentration a maximum? Round answer to the nearest tenth, if necessary. A. 30hr