Before surgery a patient is injected with a medication to help them relax. When the concentration of the drug in the bloodstream is at desired level the operation will begin. The concentration C of the drug in the patient's bloodstream is described by the function time using the formula 2 4 ( ) 2 t C t t = + . Time is measured in hours. a) Does this function have a vertical asymptote? Explain b) What is the equation of the horizontal asymptote and what does it mean in the context of this