(1 pt) which of the following represents a function? a. x = 1 1 1 1 1 y=2 3 4 5 6 b. x =1 2 1 2 1 y= 0 1 2 3 4c. x= -2 -1 0 -1 -2 y= 2 3 4 5 6 d. x= 1 2 3 4 5 y= 5 4 3 2 1

15. jiovanni is looking in to two different companies that offer study guides for math exams. test prep 101 charges a $5 flat fee and an additional $0.25 per problem. math charges a $2 flat fee and an additional $0.50 per problem. how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {