Solve the problem. The attending physician in an emergency room treats an unconscious patient suspected of a drug overdose. The physician does not know the initial concentration An of the drug in the bloodstream at the time of injection. However, the physician knows that after 3 hr. the drug concentration in the blood is 0.75 ug/ dL and after 4 hr. the concentration is 0.719 ug/dL. The modelA(t) = Ao e - represents the drug concentration A(t) in ug/ dL in the bloodstream t hours after injection. The value of k is a constant related to the rate at which the drug is removed by the body. Select one