1.Look at the following numbers:


-6, 0, 6, 12


Which pair of numbers has a sum of 0?


A: 6, 12


B: 0, 6


C: -6, 0


D: 6, -6

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2.Look at the following numbers:


-10, -5, 0, 5


Which pair of numbers has a sum of 0? (5 points)


A: -10, 5


B: 0, 5


C: 5, -5


D: -5, 0