For this question, you just have to simplify the expression. Just remember, if there's a + before the bracket, the signs of the numbers inside the bracket won't change, and you can just remove the bracket and simplify. If there's a - before the bracket, the signs of the numbers inside the bracket will change into the opposite (- will turn into + and + will turn into -). After you've opened the bracket, just simplify the expression (i.e. bring the like terms together)
The answers are:
- f
- e
- b
- a
- c
- d
I hope it helps!! :)