The half-life of caffeine in a person's bloodstream is about 6 hours. If a person's bloodstream contains 110 milligrams of caffeine, how much of that caffeine will remain after 14 hours?

21.8 mg

Explanation:

X = 110[½^(t/6)]

X = 110[½^(14/6)]

X = 21.82676446

X = 21.8

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