No.
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false, adding a number to 0 like 0+9 would =9. only when you multiply 0 by a number is the answer 0.
It is a statement equivalent to saying that 0 is the additive identity.
The sum of any number and 0 is the original number.
Their sum is 4.
Never. The sum of two negative numbers is a negative number with a value less than either of them, e.g. (-1) + (-2) = (-3) Adding two negative numbers is the same as adding their positive absolute values, and expressing the sum as a negative. If the two negative numbers are the same, and you subtract one from the other, the result is 0. e.g. (-2) - (-2) is the same as (-2) + 2 , which equals 0.