Answer:
Explanation:
If the half-life is k days, then you have
(1/2)^(300/k) = 0.696
k = 573.788
makes sense, since 69.6% is greater than 50%
Now solve for t in
(1/2)^(t/573.788) = 1/3
t = 909.432 days
makes sense -- about 1.5 half-lives
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