- A−9
- B0
- C9
- D18
Step-by-Step Solution
The opposite of an integer is the number on the other side of zero with the same distance. −9 is 9 steps left of zero, so its opposite is 9 (9 steps right of zero).
Answer: C) 9
What is the opposite (additive inverse) of −9?
Class 6IntegersIntegers
Key idea: Subtracting integers
Subtraction of integers is just adding the **opposite**: a − b = a + (−b). So 5 − 8 = 5 + (−8) = −3. And 5 − (−8) = 5 + 8 = 13. The 'minus minus' that looks confusing in symbols is simply: subtracting a negative is the same as adding its positive twin. Always rewrite subtraction as addition of the opposite — it removes every sign-error trap.
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