Following surgery, a patient has been receiving a pain relief medication intravenously. The concentration C (in milligrams per liter) of the medication in the patient's bloodstream thours after this process started is given by C(t): a) The patient will not receive pain relief unless the concentration of the medication is 20 or more milligrams per liter. Use this function to determine the time interval for which the concentration of the medication, C, will be greater than or equal to 20 milligrams per liter. 60t + 12 t +6 ,t> 0 The time interval for which the patient will receive pain relief is hours. (Express your answer in interval notation and round any decimals to the nearest tenth of an hour). b) If the intravenous medication continues to be given to the patient (that is, as time goes on and t approaches ∞0), the concentration will approach milligrams per liter.

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