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 hours. (Later we will be able to compute the dosage and time interval to ensure that the concentration of the drug does not reach a harmful level.) Find lim t→ 12€“ f(t) and lim t→ 12+ f(t) and explain the significance of these one-sided limits.

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f(t). 300+ 150 - 12 8. 16 4.