Some strategies of how to simplify an expression like 2x-5b+5x

Which fraction below is equivalent to 10/12?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

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