4. If you saved $2.00 on January 1, $4.00 on February 1, $8.00 on March 1. $16.00 on April 1, and so on. How much money
would you save in one year?

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