Consider the concentration, $C$, in mg per liter (L), of a drug in the blood as a function of $x$, the amount, in mg, of the drug given and $t$, the time in hours since the injection. For $0 \leq x \leq 2$ and $t \geq 0$, we have $C = f(x,t) = t e^{-t(3-x)}$.

Find $f(1,2.5)$:
(include units)

Be sure you can interpret what your answer means in terms of drug concentration, time and initial amount.