What is the opposite of −9?

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Multiple Choice

What is the opposite of −9?

Explanation:
Opposites on the number line and additive inverses. Every number has an opposite—the value you add to it to get zero. For −9, you need +9 to reach zero, so the opposite is 9. On the number line, you’d move the same distance to the right of zero as −9 is to the left. The other options don’t cancel out −9 to zero: adding −9 keeps you at −18; adding 0 leaves you at −9; adding −18 goes even further away to −27. So 9 is the correct opposite.

Opposites on the number line and additive inverses. Every number has an opposite—the value you add to it to get zero. For −9, you need +9 to reach zero, so the opposite is 9. On the number line, you’d move the same distance to the right of zero as −9 is to the left. The other options don’t cancel out −9 to zero: adding −9 keeps you at −18; adding 0 leaves you at −9; adding −18 goes even further away to −27. So 9 is the correct opposite.

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