Question 151244
Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after x years can be described by A(x)=100e^-0.01657x. How much is remaining after 257 years. Round the answer to the nearest hundredth of a milligram.
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A(257) = 100e^(-0.01657*257)
A(257) = 100[0.01414...]
A(257) = 1.414... milligrams 
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Cheers,
Stan H.