In division and multiplication they do. for example: -2 x -2 = +4 but in addition you get rid of the '+' (-2 + -2 = -2 - 2 = -4) and in subtraction get rid of the last two '-'s and add a '+' (-2 - -2 = -2 + 2)
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Your question does not make sense. It would probably be interpreted as a + = ++a ---a
-- If they're being multiplied or divided, then they make a minus. -- If they're being added or subtracted, then they can make either a plus or a minus. It depends on which one is bigger.
A plus + a plus is a plus.
In addition and subtraction, if the plus sign is larger than the minus sign, then it's a plus. For example: +10 minus -20 = -10 If the plus sign is smaller than the minus sign, the answer will be a minus. For example: -10 minus + 20 = -10 In multiplication, if you have 2 plus signs, the answer will be a plus sign. If you have 2 minus signs, the answer will be a plus sign then, too. But if you have a plus and a minus sign, then the answer will be a minus. For example: +5 x + 2 = +10 -5 x - 2 = +10 -5 x +2 = -10
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