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After a medication is administered to a patient, the concentration (in micrograms per liter) of its active ingredient in the blood is modeled by the function \(f\) defined on \([0, +\infty[\) by:$$f(t) = 15e^{-0.2t}$$where \(t\) represents the time in hours after administration.
Determine the initial concentration.
Determine the concentration after two hours. Round your answer to the nearest hundredth.
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