Question 83458
One type of uranium has radioactive decay rate of 0.5%. If 20 pounds of this uranium is available today, find how much will still remain after 30days. 
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A(t) = Ao (1-0.005)^t
A(30) = 20(0.995)^30
A(30) = 20*0.8604
A(30) = 17.208 lbs.
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Cheers,
Stan H.