MATH 1141_AS1 (2).pdf [10 marks] [8 marks] [12 marks] (4 marks) (4 marks) (4 marks) [10 marks] (4 marks) (4 marks) (2 marks) [10 marks] 5. An elecuicity company charges its customers a base rate of $15 a month plus 8 cents per kilowatt-hour (kWh) for the rst 1200 kWh and 12 cents per kWh for usage over 1200 kWh. Write the cost, C, in dollars as a function of x, the number of kWh used for 0 S x 00? 2+3)\" A-lnx 9' For the function f (x) = MATH 1141_AS1 (2).pdf 80% MATH1141: Calculus I A1-3 (5 marks) a. Find f-1(x). (5 marks) b. Check that f-1 (f (x)) = x. [10 marks] 10. Find the exact value of each expression. (3 marks) a. sin-1 (sin ST) (3 marks) b. cos-1 (elni-; in2) (4 marks) c. sin(2sin-1 )