Friends ?? anyone ? nsbdhbjbewhbdesh

How do i work this problem out using the equation a=pe^rt

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 number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2