Can someone please help me 11 a &b and 12 a & b and put the steps if possible, if not just please tell me the answer

12x + 1 = 25 solve the following equation. then place the correct number in the box provided.

Anyone know? will mark brainliest if correct!

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