Question

A Particular pain relieving medicine has a decay rate of 24% an hour. A patient was given a dose of the medicine 5 hours ago and there is currently 74mg of the medicine in the patients bloodstream.
Q: What was the Origional dose of the medicine? ________ milligrams.
Q How long will the patient need to wait for there to be less than 25% of the original dose of the medicine left in the bloodstream? _______hours. (to the nearest tenth of an hour)
initial dose 291.8529. 25% mark in 5.1 hours

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