If the exponent is an even number you can drop the negative, because is you were to multiply it out the negatives would cancel out.
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Yes. It can also be negative in the numerator. Both positive and negative numbers (as well as zero) can be rational numbers. Both positive and negative numbers can be irrational numbers. Both positive and negative numbers (as well as zero) can be integers.
Rational numbers can be negative or positive.
The product of all those numbers will always be a negative number.
always positive
no, all negative numbers are smaller than positive numbers