Is this a function? Also i need help with the domain and range idk if this ends or not

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

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

50 points~ ! i have to turn this in tomarrow