HELP ASAP PLS

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

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Aline passes through 3,7 and 6,9 what equation represents the line