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After several drinks, a person has a blood alcohol level of 200 mg/dL (milligrams per deciliter). If the amount of alcohol in the blood decays exponentially, with one fourth being removed every hour, find the person's blood alcohol level after 2 hours.

  • math -

    after 1st hr: 200 - 200/4 = 200 - 50 = 150 mg/dL remaining,

    after 2nd hr: 150 - 150/4 = 150 - 37.5 = 112.5 mg/dL remaining.

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