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The concentration C (t) (in mg/cm ) of a drug in a patient's bloodstream after t hours is C (t) = 0.016t 12 +61+6 Find the maximum concentration of a drug. (Use decimal notation. Give your answer to five decimal places.) Cmax = mg/cm3 Determine the time at which the maximum concentration of a drug occurs. (Use decimal notation. Give your answer to three decimal places.) hours 1 =