It is the number with the same magnitude (absolute value) and the opposite sign.
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yes
Yes.
Always, unless the original number is zero. This does not have an inverse.
The answer will depend on what you mean by "opposite": the additive inverse or the multiplicative inverse.
An inverse, without any qualification, is taken to be the multiplicative inverse. is The inverse of a number, x (x not 0), is 1 divided by x. Any number multiplied by its inverse must be equal to 1. There is also an additive inverse. For any number y, the additive inverse is -y. And the sum of the two must always be 0.