What is the mean of the numbers??

What is the solution of sqrt x+2-15=-3

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 exponential function has an initial value of 2? f(x) = 2(3x) f(x) = 3(2x)