That’s not the right answer to my question

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 is true for the relation f(x)=2x^2+1

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price