1) After a drug is administered intravenously to a patient, it is gradually metabolized and eliminated from the patient’s bloodstream. Suppose a patient is administered 500 milligrams of a drug and it is eliminated at a rate of 6% per hour. a) Write a formula for D, the amount of the drug in the patient’s bloodstream(in mg) as a function of time t (in hours after the drug is administered). b) How much of the drug remains in the patient’s bloodstream after 12 hours? c) How many hours until the amount remaining is 50 mg