SOLUTION: A radioactive substance decays exponentially. A scientist begins with 200 milligrams of a radioactive substance. After 19 hours, 100 mg of the substance remains. How many millig

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Question 1153655: A radioactive substance decays exponentially. A scientist begins with 200 milligrams of a radioactive substance. After 19 hours, 100 mg of the substance remains.
How many milligrams will remain after 29 hours?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Half-life is 19 hours.

highlight_green%28y=p%281%2F2%29%5E%28x%2F19%29%29

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How many milligrams will remain after 29 hours?
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Assuming the beginning was from 0 hours when p was 200 mgs of the substance, question asks for y=200%281%2F2%29%5E%2829%2F19%29.