13. 3 x (-2) = ____ 14. -4 x -5 = ____

15. (-15) (-5) = ____

16. (48) (-12) = ____

17. (-2) + (+4) = ____

18. -20 + 12 = ____

19. 25 – (-10) = ____

20. (-15) – (-8) = ____​

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