4 hours after an intravenous infusion begins can be modeled by A(t)-(1-) where r is the rate of infusion per hour and k is the exponential constant for the drug. le. Find the average rate of change of drug in patient's bloodstream between t 0. Repeat it for t 4 and t 6. (In all calculations, round to 2 decimal places.) t Your Answer: 2 and e What happens to the amount of drug in patient's bloodstream after a long period of time? (ie. What is the limit of the function as t approaches to co?) Your Answer: