3. When a person takes a drug, one can measure the number of milligrams of the drug in a person's system after t hours. This amount is given by D(t)= A-et, a. Assume that a person takes 20 milligrams at the beginning. Determine A. b. Assume that the number of milligrams decreases by 20% every hour. Determine B. c. Now assume that instead, the number of milligrams decreases by 20% every 2 hours. Determine B.

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