Yes.
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No- adding negative numbers is like adding positive numbesr , except the answer is negative.
They are different in the same way that subtraction of integers is different from their addition.
The answer also has the same sign.
They aren't. The rules are the same as those for adding/subtracting or multiplying integers. Just be careful of the decimal point's location.
It is the same thing, since "integers" consists of positive and negative numbers (and zero).