SOLUTION: The decay of 422 mg of an isotope is given by A(t) = 422e-0.016t, where t is time in years. Find the amount left after 17 years. Does anybody have any pointers about how to input t

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Question 212343: The decay of 422 mg of an isotope is given by A(t) = 422e-0.016t, where t is time in years. Find the amount left after 17 years. Does anybody have any pointers about how to input these values on a scientific calculator?
Answer by Edwin McCravy(6939) About Me  (Show Source):
You can put this solution on YOUR website!
The decay of 422 mg of an isotope is given by A%28t%29+=+422e%5E%28-0.016t%29, where t is time in years. Find the amount left after 17 years. Does anybody have any pointers about how to input these values on a scientific calculator?
 
On a TI-83 or 84, type this on the main screen:

422e^(-0.016*17)

Press ENTER

and read 321.5024982 or about 321.5 mg left

Edwin