Find the measure of angle A

What is (28 + 7 + 6 + 3) x 1/2 show your work

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

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.