Anywhere where negative quantities exist.
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Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered. There are many arithmetical operations that can combine a negative integer and a rational number.
I would do it that way.
I don't think velocity can be a negative number... Use positive.
You can use any number - rational or otherwise - as an exponent.
I would hope all elections use rational numbers: all Counting numbers are Rational numbers.