1. The problem statement, all variables and given/known data See attached image. 2. Relevant equations Left- and right-handed limits. 3. The attempt at a solution I know lt (t -> 12-) f = 150 mg and lt (t -> 12+) f = 300 mg, but I don't know how to explain these numbers. I'm assuming that measurements are taken and that this graph is from these measurements. But then why can't we say f(0) = 150 mg? Does this mean that a measurement is taken "a short time after" the drug is given? Thanks for any help.