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