Answer:
If you're refering to the additive inverse then it's, -8.4
Explanation:
To get an additive inverse or more so an opposite, you simply add the negative to the original for 0.
Example: 8.4 + -8.4 = 0
-8.4
Because if you want to find the opposite of a number then you find that same number on the other side on the number line for example, -4.5 you would go on the other side and you would get positive 4.5
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