1. [-/3 Points] DET Absorption of Drugs The concentration of a drug in an organ at any time t (in seconds) is given by if 0 t 20 if t > 20 C(t) = ={} 0.45t 27(1 e-t/60) 27e-t/60-18e-(t - 20)/60 - where C(t) is measured in milligrams per cubic centimeter (mg/cm). (a) What is the initial concentration of the drug in the organ? mg/cm (b) What is the concentration of the drug in the organ after 11 sec? (Round your answer to three decimal places.) mg/cm (c) What is the concentration of the drug in the organ after 31 sec? (Round your answer to three decimal places.) mg/cm