Final answer:
The opposite of any integer is the same number but with the opposite sign. Therefore, the opposite of the integer 12 is -12.
Step-by-step explanation:
In mathematics, the opposite of an integer is the same number but with the opposite sign. In other words, it is the number that you would need to add to your starting integer to get zero.
So, the opposite integer of 12 is -12. When you add 12 and -12 together, you get 0, which shows that -12 is indeed the opposite of 12.
Learn more about Opposite Integers