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Math 7 Grade 7. Can anyone help me answer these questions?

1. What is the opposite of -2?

2. When we add opposites together they will always equal = ?
-1 1 or 0

This is also known as what ?
additive inverse or opposite addition or inverse?

Adding with integers with SAME signs.

-8 + -3 = ?

-12 + -15 = ?

-3 + -9 + -25 = ?