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Mathematics 12 Online
OpenStudy (anonymous):

The amount of a particular drug in a person’s bloodstream decreases by 12% per hour after taking the drug. Suppose Alicia takes an initial dose of 400 mg. a. Write an equation relating the amount of the drug in her bloodstream, y, to the number of hours after she took it, x. b. Find the amount of drug in her bloodstream, to the nearest milligram, 4 hours after she took the initial dose.

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