<PRE><B>Question 477838</B>
 The half-life of a certain radioactive material is 76 hours. An initial amount of the material has a mass of 794 kg. 
1. Write an exponential function that models the decay of this material.
A(t) = 794(1/2)^(t/76)
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2. Calculate the amount of radioactive material remaining after 15 hours. Round your answer to the nearest thousandth.
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A(15) = 794(1/2)^(15/76)
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A(15) = 794*(0.8721)
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A(15) = 692.48 kg
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Cheers,
Stan H.
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