The graph shows the amount of a medicine m, in milligrams, remaining in a patient's body / hours after receiving an injection. The amount of the medicine decreases exponentially. a. By what factor did the medicine decrease in the first hour and a half? b. How much medicine is remaining in the body 3 hours after the injection? c. Write an equation for the amount of medicine (m) based on the number of hours since i was injected (h).

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