The concentration of a drug
t
hours after being injected is given by
C
(
t
)
=
0.9
t
t
2
+
50
\displaystyle {C}{\left({t}\right)}=\frac{{{0.9}{t}}}{{{t}^{{2}}+{50}}}
C
(
t
)
=
t
2
+
50
0.9
t
. Find the time when the concentration is at a maximum. Give your answer accurate to at least 2 decimal places.
hours.
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