In Exercises 13-28, add as indicated. 13. -3 + (-8) 14. -5 + (-10) 15. -14 + 10 16. -15 + 6 17. -6.8 + 2.3 18. -7.9 + 2.4 11 19. 15 3 7 20. 10 2 3 4. -이 - 위 21. 22. 9. 4. 5 23. -3.7 + (-4.5) 24. -6.2 + (-5.9) 25. 0 + (-12.4) 26. 0 + (-15.3) 27. 12.4 + (-12.4) 28. 15.3 + (-15.3)

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