Name: 8. Medicine is administered to a patient by direct injection into a vein. The amount of medicine (in milligrams per mL blood) in the patient's bloodstream t hours after the injection is given by the following function. (5 marks) M(t) 5 a) What is the rate of change in the amount of medicine 4 hours after the injection? Put a box around your final answer. b) What is the significance of a negative answer? +