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The concentration of a drug in body fluids depends on the time (t) elapsed after its...

The concentration of a drug in body fluids depends on the time (t) elapsed after its administration. Assume that after 4 hours, 60% of the drug remains in the body and that the amount of drug decreases exponentially. How much drug is left after 6 hours? How long should it take for only 10% of the drug to remain?
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