-3, 7, 8, and -5 from least to greatest would be -5, -3, 7, 8.
For the next few, here are the simplified equations and answers.
2) 9+7
16
3) 14-7
7
4) 9-3
6
5) -(12+14) this means your answer will be negative.
-25
6) 7-9
-2
7) 8-4 is the same as 8+(-4)
4
8) -9+5 is the same as 9-(-5)
-4
9) 4-1 is the same as 4+(-1)
3
10) 7-(-4) is the same as 7+4
11
Good luck! :)