A car rental company charges 60 dollars per day, 14 cents per kilometre driven, and a 30 dollar onetime processing fee for a car rental. (a) Write a formula for the cost C (in dollars) of renting a car as a function of the number of days d and the number of kilometres driven k. C: (b) If C : f(d, k), then f(3, 580) : dollars. Suppose that C : f(:1:, t) : 2213603"mJt represents the concentration (in mg/liter) of a drug in the blood t 2 0 hours after :1: mg of the drug is injected. (a) Evaluate f(3,5) : (b) Give a practical interpretation of your answer in part (a): f(3, 5) is... QA. the change in concentration of a 3 mg dose in the blood 5 hours after injection. 0 B. the amount of a 5 mg dose in the blood 3 hours after injection. C. the concentration of a 3 mg dose in the blood 5 hours after injection