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Mathematics
Problem
A medication in the bloodstream decays according to the model
Q
(
t
)
=
Q
0
e
k
t
Q(t)=Q_0 e^{kt}
Q
(
t
)
=
Q
0
e
k
t
, where
k
=
−
0.25
hr
−
1
k=-0.25\,\text{hr}^{-1}
k
=
−
0.25
hr
−
1
. How many hours will pass before 90\% of the initial amount remains? Give your answer to two decimal places.
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