A patient receives a 150 mg injection of a drug every 4 hours. The graph shows the amount (t) of the drug in the bloodstream after t hours. f(1) 300 150% 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 200 175 Therefore, lim f(x) = 350 - 175 mg. X - 16 - Step 2 As x approaches 16 from the right, the y-values approach Therefore, lim f(x ) = mg . x - 16+