For time t ≥ 0, the function C = ate^−bt with positive constants a and b gives the concentration, C, of a drug in the body. Figure 4.98 shows the maximum concentration reached (in nanograms per milliliter, ng/ml) after a 10 mg dose of the cough medicine hydrocodone bitartrate. Find the values of a and b.

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C (ng/ml) 23.6 1.3 Figure 4.98 t (hours)