<PRE><B>Question 1130123</B>
A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 32 grams. Write an exponential equation f(t)representing this situation. (Let f be the amount of radioactive substance in grams and t be the time in minutes.)
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y = a*b^t
32 = 250*b^t
32 = (250 grams)*k^(250 min) 
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Cheers,
Stan H.

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