The answer depends on whether the "opposite" means the multiplicative inverse or the additive inverse.
When the number is 0.
Yes! When the number is negative, the absolute value of it'll be its opposite.
When the numbers are negative
0
the number 0 is always equal to its opposite
When the number is 0.
When the number is non-positive.
Yes! When the number is negative, the absolute value of it'll be its opposite.
When the numbers are negative
The absolute value of a negative number is positive.
Because that is how the opposite is defined!
0
Because the opposite of 8 for example is -8 and 8+(-8) = 0
Only if the rational number is 0.
No, never.
the number 0 is always equal to its opposite
If a number is zero or positive, then its absolute value is equal to the number.