Alright, let's find the sums step-by-step:
1. [tex]\(3 + (-3) = 0\)[/tex]
2. [tex]\(24 + 15 = 39\)[/tex]
3. [tex]\(-6 + 3 = -3\)[/tex]
4. [tex]\(2 + (-19) = -17\)[/tex]
5. [tex]\(-13 + 28 = 15\)[/tex]
6. [tex]\(-25 + 1 = -24\)[/tex]
7. [tex]\(27 + 16 = 43\)[/tex]
8. [tex]\(14 + 25 = 39\)[/tex]
9. [tex]\(12 + (-23) = -11\)[/tex]
10. [tex]\(-20 + 3 = -17\)[/tex]
11. [tex]\(1 + (-8) = -7\)[/tex]
12. [tex]\(-22 + 5 = -17\)[/tex]
13. [tex]\(-14 + 19 = 5\)[/tex]
14. [tex]\(3 + 13 = 16\)[/tex]
15. [tex]\(23 + (-8) = 15\)[/tex]
16. [tex]\(7 + (-6) = 1\)[/tex]
17. [tex]\(-15 + 6 = -9\)[/tex]
18. [tex]\(-17 + (-28) = -45\)[/tex]
19. [tex]\(19 + 21 = 40\)[/tex]
20. [tex]\(-20 + (-6) = -26\)[/tex]
21. [tex]\(2 + 2 = 4\)[/tex]
So, all of the sums are:
[tex]\[
[0, 39, -3, -17, 15, -24, 43, 39, -11, -17, -7, -17, 5, 16, 15, 1, -9, -45, 40, -26, 4]
\][/tex]