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.

Question

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.

anonymous · Answer

Just plug x=294 into your equation.

anonymous · Answer

what is the e?

anonymous · Answer

http://en.wikipedia.org/wiki/E_%28mathematical_constant%29

anonymous · Answer

after finding x i get 100e^-5.292

anonymous · Answer

Finding x? x=294

anonymous · Answer

i multiplied 294 or x by -0.018x and got -5.292. i now have 100e^-5.292. now what

anonymous · Answer

Put that into a calculator.

anonymous · Answer

ok. i got .5 (rounder). correct?

anonymous · Answer

Yep.

anonymous · Answer

okidoki. thanks. medal