document.write( "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.\r
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Algebra.Com's Answer #775931 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
Half-life is 19 hours.\r
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\n" ); document.write( "\n" ); document.write( "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\".
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