Literally what is this answer?

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

Which of the following are accepted without proof in a logical system? check all that apply.

What statement is true? 2x^2-9x+2=-1