I need help with this

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

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

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