anonymous
  • anonymous
Suppose the amount of a radioactive element remaining in a sample of 100 milligrams after X years can be described by A(x) = 100e^-0.018x. How much is remaining after 294 years? Round the answer to the nearest hundredth of a milligram.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Just plug x=294 into your equation.
anonymous
  • anonymous
what is the e?
anonymous
  • anonymous
http://en.wikipedia.org/wiki/E_%28mathematical_constant%29

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anonymous
  • anonymous
after finding x i get 100e^-5.292
anonymous
  • anonymous
Finding x? x=294
anonymous
  • anonymous
i multiplied 294 or x by -0.018x and got -5.292. i now have 100e^-5.292. now what
anonymous
  • anonymous
Put that into a calculator.
anonymous
  • anonymous
ok. i got .5 (rounder). correct?
anonymous
  • anonymous
Yep.
anonymous
  • anonymous
okidoki. thanks. medal

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