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The plus values become negative and the negative values become positive although their numerical values remain the same
Yes
Yes.
[ -2n ] is positive for all negative values of 'n' .
No. A negative plus a negative will always be negative. Adding negatives just makes them more negative, just like adding positives makes them more positive.If you're thinking of multiplication, then the answer is yes. Like signs result in positive values. Opposite signs result in negative values.