lidl must be completed sequentially. If you skip a part of the question, you will not receive any points for the skipped part, and you will not be able to come back to the skipped part. Tutorial Exercise A patient receives a 150 mg injection of a drug every 4 hours. The graph shows the amount f(t) of the drug in the bloodstream after t hours. f (t ) 300 - 150% 4 8 12 16 Find lim f(1) and lim f(t). 1 - 16 - 1 - 16+ Step 1 As x approaches 16 from the left, the y-values approach Therefore, lim f ( x ) = mg . x - 16