A car rental company charges 55 dollars per day, 10 cents per kilometre driven, and a...

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A car rental company charges 55 dollars per day, 10 cents per kilometre driven, and a 20 dollar one-time 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 (3,850) = dollars. Suppose that C = f(x,t) = 24te(5x)t represents the concentration (in mg/liter) of a drug in the blood t 0 after x mg of the drug is injected. (a) Evaluate f(2,4) = (b) Give a practical interpretation of your answer in part (a): f(2, 4) is... A. the amount of a 4 mg dose in the blood 2 hours after injection. B. the change in concentration of a 2 mg dose in the blood 4 hours after injection. C. the concentration of a 2 mg dose in the blood 4 hours after injection. hours Find the indicated partial derivatives of: fx(x, y) = fy(x, y) = -4x + 8y f(x, y) = 1x + 3y Find the indicated partial derivatives of: af 58 52 af f(x, y) = xyey A car rental company charges 55 dollars per day, 10 cents per kilometre driven, and a 20 dollar one-time 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 (3,850) = dollars. Suppose that C = f(x,t) = 24te(5x)t represents the concentration (in mg/liter) of a drug in the blood t 0 after x mg of the drug is injected. (a) Evaluate f(2,4) = (b) Give a practical interpretation of your answer in part (a): f(2, 4) is... A. the amount of a 4 mg dose in the blood 2 hours after injection. B. the change in concentration of a 2 mg dose in the blood 4 hours after injection. C. the concentration of a 2 mg dose in the blood 4 hours after injection. hours Find the indicated partial derivatives of: fx(x, y) = fy(x, y) = -4x + 8y f(x, y) = 1x + 3y Find the indicated partial derivatives of: af 58 52 af f(x, y) = xyey