\fAcar rental company charges 50 dollars per day, 10 cents per Kilometre driven: and a 40 dollar onetime processing fee for a car rental. {3) Write a formula for the cost C [in dollars) of renting a car as a function of the number of days at and the number of kilometres driven to. C: (o) lfC = f[d,k}, then 313,880} 2 dollars. Suppose thatC = z,t} = 20:9 ['3 3\" represents the concentration (in mgIliter} ofa drug in the blood it :3 III hours after; mg ofthe drug is injected. (a) Evaluate f(3,4) = (o) Give a practical interpretation of your answer in part (a): f[3,4) is... -:jjj:- A. the change in concentration era 3 mg dose in the blood 4 hours alter injection. B. the concentration of a 3 mg dose in the blood 4 hours after injection. -:j:j:- C. the amount of a 4 mg dose in the blood 3 hours afterinjection.