no example 2-3=-1 it can be positive: 3-2=1
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No, it is always irrational.
A positive rational number.
Yes, a negative number subtracted from a positive number will always be positive. Subtracting a negative number is the same as adding the opposite of the negative number. The opposite of a negative number is always positive. A positive number plus a positive number is always positive.
Yes. The rational numbers are a closed set with respect to subtraction.
There is no simple answer:Zero is smaller than any positive number.Zero can be larger or smaller than a rational number.A rational number can be larger or smaller than a positive number.