4. [6 pts] A drug is injected into the bloodstream of a patient through her right arm. The concentration of the drug in the bloodstream of the left arm I hours after the injection is given by Cit): 0.214s t +1 a. Use derivatives to determine the maximum drug concentration in the patient. When does this occur? b. What is the average concentration of the drug in the bloodstream in the left arm during the rst hour after the injection? During the rst 2 hours after the injection