I. Add/Subtract.

1. 2 - 5=
2. - 4 + 7=
3. -14 - 20=
4. 19 - 15=
5. 12 - 16=
6. - 1 - 9=
7. 10 - 8 -20=
8. 5 + 14 - 20=
9. 8m + 3m=
10. 3a - 4a =
11. 2x + 5× =
12. - 2a - 3a=
13. 30m + 6m - m=
14. - 2a - 18a + 5a=
15. 5x + 6y=

Need help pls ty