i think yes, because you can combine 2 and -2, which are like terms, so why not 2a and -2a?
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It depends on what you do with the negative and positive. If you multiply or divide a positive number and a negative number, then the answer is negative. If you add or subtract a positive number and a negative number, the answer could be negative or positive depending on the numbers involved. If you put a negative sign in front of a positive number, the result is a negative number. If you put a positive sign in front of a negative number (like +(-7)), the result is still negative.
an integer is a negative number and a positive number. It is all the numbers, just like a natural number is all the numbers from 1 and up
Yes it does. Because the it acts like subtraction, but since the positive, negative number scales run backwards like a mirror, subtraction is addition with two negative numbers.
It depends, if your adding -12 to 13 its like minusing 12 so its 1. but if its 11 + -12 its again like minusing 12 so its -1. :)
You will get a positive integer. If you subtract a negative number, you will be adding it. I think of it like 2 minuses equals a plus. :P