It is NOT necessarily a positive. It will be positive only if it is a larger number minus a smaller number.
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Because "minus a negative" is tha same as "plus a positive". So, a positive minus a negative is a positive plus a positive which is a positive.
it equals a positive.
positive 4
"Minus a negative" is the same thing as "plus."
8 minus negative three or 8--3 equal positive 11. The double negative converts the minus sign into a plus sign and the negative into a positive.