Which expression is equivalent to t+4+3-2

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Which equation represents the function on the graph?

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?