plus or minus. You see it often with square roots. The square root of 9 is plus or minus 3.
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A signed integer is one with either a plus or minus sign in front. That is it can be either positive or negative.An unsigned integer is assumed to be positive
Yes. For Example 4--4 would be 8 because you are in theory just adding. Just imagine a giant plus sign in between the two fours.
It is less than 0. That is what the minus sign, "-", means!
the sum of 2021 nonnegative integers is 2020. what is the product of the numbers