K If C(t) = 18.5te--0.3 measures the Ay + 24- concentration, in ng ml , of a drug in a person's 22- system t hours after the drug is administerd 20- and the minimum effective concentration is 18- 16- 14 _9 147 ml a) Find the onset time to the nearest half hour. b) Find the termination time to the nearest half hour. X . . . a) Onset time, to the nearest half hour, is hours b) Termination time, to the nearest half hour, is hours