SOLUTION: Strontium-90 has a half-life of 29 years. How long will it take for an initial sample of 10mg to decay to 1mg?

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Question 873396: Strontium-90 has a half-life of 29 years. How long will it take for an initial sample of 10mg to decay to 1mg?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
Q(t) = +Q%5B0%5De%5E%28-kt+%29
Find k
ln(.5)/-29 = k = .0239
Then
ln%28.1%29%2F%28-.0239%29 = t