A doctor prescribes 125 mg of a drug. The amount of the drug in the patient's body decays by 20% every hour. Part 1 Write an exponential model for the A(t), the amount of the drug in the patient's system after t hours have passed. A(t) = help (formulas) Part 2 Use your formula to find the amount of the drug remaining after 3 hours have passed. Round your answer to the nearest tenth. help (numbers) mg Part 3 What is the half-life of this drug? Round your answer to the nearest whole number.

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