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A certain drug is eliminated from the bloodstream with a half-life of 36 hours. Suppose that...

A certain drug is eliminated from the bloodstream with a half-life of 36 hours. Suppose that a patient received an initial dose of 30 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 15% of its initial level?

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