Help I need someone smart

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

Find the missing factor. write your answer inexponential form.9^2=9^4×

Find the axis of symmerty for x y=x squared -4x-8