Posted by cassandra on Monday, May 2, 2011 at 4:56pm.
Is it?
7 - (-15)?
or
7 - 15?
7 - (-15) equals?
When adding and subtracting negative numbers, the answer is positive when you have two negatives.
Study this site carefully.
http://www.mathsisfun.com/positive-negative-integers.html
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