Brianna D.

asked • 11/20/14

If a 25 mg sample of radioactive material decays to 18.4 mg in 5 years, how long will it take the sample to decay to 20.5 mg?

I can solve the first part of the question: 
25*e^-5k = 18.4
So, k = ln(18.4/25)/-5 = 0.0613 
 
But the rest I need help with. Thanks in advance!

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