Perhaps you mean minus minus one is plus one. Like subtracting (taking away) a debt is equivalent to adding on. If you bank balance is two dollars in the red (debt) if you add 2 dollars, that debt has gone. minus 2 minus minus 2 is zero, same as minus 2 plus 2 is zero.
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Yes. A negative subtracted by a negative is a positive. Just remember that two like signs become a positive sign, and two unlike signs become a negative sign.
Think of it this way: It's like spreading the negative sign flu that cancels each other out. positive * positive = positive negative * positive = negative positive * negative = negative negative * negative = positive
It would be a minus sign. If the two signs are the same, the answer is positive. If the two signs are different, the answer is negative.
if the 2 signs are negative, than the sum is negative. if the 2 signs are positive, than the sum is positive.
if both have the same sign the answer is positive, if they have different signs the answer is negative.