Ay anyone willing to help me with my work kinda lost

Tcan be concluded that % of the seniors would prefer to see more candid pictures in this year's edition of the yearbook.

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

What is the result of adding the system of equations? 2x+y=4 3x-y=6