Next weekend marnie wants to attend either carnival a or carnival b. carnival a charges $6 for admission and an additional $1.50 per ride. carnival b charges $2.50 for admission and an additional $2 per ride. a) in function notation, write a(x) to represent the total cost of attending carnival a and going on x rides. in function notation, write b(x) to represent the total cost of attending carnival b and going on x rides. b) determine the number of rides marnie can go on such that the total cost of attending each carnival is the same. [use of the set of axes below is optional.] c) marnie wants to go on ve rides. determine which carnival would have the lower total cost. justify your answer.