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Question 12 0/7 pts 9 2 0 Details A radioactive substance decays exponentially. A scientist begins with 180 milligrams of a radioactive substance. After 13

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Question 12 0/7 pts 9 2 0 Details A radioactive substance decays exponentially. A scientist begins with 180 milligrams of a radioactive substance. After 13 hours, 90 mg of the substance remains. How many milligrams will remain after 21 hours? mg Give your answer accurate to at least one decimal place. Check

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