It goes after the negative symbol. For instance, if you have negative four dollars, you would write it as such:
-$4.00
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The cent sign is put after the number, as opposed to the dollar sign, which is put before the number.
The sum can go either way. The sign of the sum will be the same as the sign of whichever original number is bigger (without regard for signs).
The rule is if a number is positive you add them. EX: 4+4=8 But if the numbers are both negative... you forget the plus sign and just put the numbers together and use whatever sign they have. EX: -4-4= -8 you see? you are adding them put if they are negative, they go down the number line. not up. Just picture a number line, if you add a negative number to an already negative number, wouldn't the number go to the left? The answer is yes. Yes it would. :)
I believe the parentheses eliminate the need for the negative sign. For example: negative $100,000 would be expressed $(100,000). Using the negative sign, it would read: -$100,000.
It goes after the number