- 6a+9
- 5m+4
- 8c+12
- .
- .
- .
- 9a
- 11x
- -4m+5
- 5x+3
- 11p+8
- 4a+13
- -3a-6b
- -9x-4y
- 30+6x
- 5a+6
- -18+6r
- -8x+10 
Explanation:
Hopefully I'm right,but what you do is add the ones with variables together so
 Question 15
3a + 2 + 3a + 7 
 so  3a+3a= 6a and 7+2=9
so you have to add the ones that are similar but never add
  3a+7 because they are not the same
 37. 5x-2y
38. -3a+2b