If the numerator is negative and the denominator is positive then the fraction will be negative. If the numerator is negative and the denominator is negative too then the fraction will be positive.
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There is no simple answer to the question.If only the numerator is negative then the fraction is a negative fraction which may be proper or improper. If the numerator and the denominator have the same sign then the fraction is positive. It is an improper fraction if they are both negative and a proper fraction if they are both positive.
You can have negative exponents anywhere. When they are in the denominator, they are equivalent to positive exponents in the numerator of a fraction.
If they are both negative, it becomes positive. (just like subtracting a negative - same as adding.) x/y = -x/-y
Any integer, whether positive or negative, is a rational number. It can be expressed as a fraction with a negative numerator and a denominator of 1.
The fraction gets smaller or increases, depending on whether the numerator and denominator are positive or negative.