A certain drug is eliminated from the bloodstream with a half-life of 36 hours. Suppose that a patient receives an initial dose of 80 mg of the drug at midnight. a. How much of the drug is in the patient's blood at noon later that day? b. When will the drug concentration reach 5% of its initial level? a. The reference point is E] If t is measured in hours, what is the exponential decay function? yo) = E (Type an expression. Do not round until the nal answer. Then round coefcients to six decimal places as needed.) How much of the drug is in the patient's blood at noon later that day? There are approximately |:| mg of of the drug in the patient's blood at noon later that day. (Do not round until the nal answer. Then round to two decimal places as needed.) b. When will the drug concentration reach 5% of its initial level? After approximately D hours, the drug concentration will reach 5% of its initial level. (Do not round until the nal answer. Then round to two decimal places as needed.)