Which of the following is an arithmetic sequence?

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

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

If chord ab is congruent to chord cd, then what must be true about ef and eg?