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If the number has a + sign then you add it, if it has a - sign, then you subtract it.
The cent sign is put after the number, as opposed to the dollar sign, which is put before the number.
If a number doesn't have a sign, you can generally assume that it is positive.
Think of it like this:The product of a negative number times a number (call it B), will be the opposite sign of the sign of number B.The product of a positive number times a number B, will have the same sign as the sign of number B.
Count the number of negative numbers. If this is an even number, the sign is + and if it is odd, the sign is -.