no
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No, because if the positive was 8, and the negative was -4, the difference would be positive four.
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.
sometimes
No. A positive times a negative is always negative. A negative times a negative is always a positive.