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After a patient consumes a medication, the amount of drug that remains in the body decays...

After a patient consumes a medication, the amount of drug that remains in the body decays exponentially. Suppose a patient takes an 800 mg tablet of a given drug, and after 4.5 hours, only 550 mg remains. When will there be only 25 mg of the drug remaining? What is the drug's half-life?

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