The concentration of a drug in a patient's bloodstream after t hours is modeled by the formula

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The concentration of a drug in a patient's bloodstream after t hours is modeled by the formula C(t) = 11(0.72)t, where C is measured in milligrams per liter.

(a) What is the initial concentration of the drug? 

(b) How long does it take for the concentration to decrease to 50% of its initial level?

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