Please help with these questions. Thanks

Problem 1. (1 point) Let f(x) = 4x and g(x) = 9x2. Find the area of the region enclosed by f(x) and g(x). Answer: Problem 2. (1 point) Let f(x) = 6x and g(x) =x2+ 3. Find the area of the region enclosed by f(x) and g(x). Answer: Problem 3. (1 point) Suppose f(x, y) = xy +4. Determine each of the following: f(-5, -4) = f( -4, -5) = f (0, 0) f(1, -4) 11 11 11 11 f (t, 6t) f(uv, u - v) Problem 4. (1 point) 3x + 5y The domain of the function f (x, y) = x2 + 12 - 4 is ? Problem 5. (1 point) A car rental company charges 40 dollars per day, 12 cents per kilometre driven, and a 40 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 f(3, 820) = _ dollars