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Drug Concentrations

Problem 3- Calculate the time it takes for the blood concentration of a drug decrease by a given percentage.

3.
If for Drug X, r = 0.20 1/hr, how long after injection does it take for the concentration of a Drug X to decrease to 35% of its initial level? Round your answer to the nearest tenth and use the model, C(t) = C0- rt.
 
Answer: ≈
hours
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