The concentration of a drug in the body decreases exponentially after a subjects averaged 11 micrograms/milliliter (mcg/mL) of the drug in their blood plasma 1 hr after a 1000-mg dosa and 5 micrograms/milliliter 4 hr after dosage. Assume the concentration decreases according to the exponential decay model. a) Find the value k, and write an equation for an exponential function that can be used to predict the concentratic of the drug, in micrograms/milliliter, t hours after a 1000-mg dosage. b) Estimate the concentration of the drug 2 hr after a 1000-mg dosage. c) To relieve a fever, the concentration of the drug should go no lower than 5 mcg/mL. After how many hours will 1000-mg dosage drop to that level?

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