the water at jacobs house was flowing at a rate of 7/8 gallons per 1/2 minute. how fast was the water flowing in gallons per minute​

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online