Yes, -3 is an integer.
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positive + positive = positive negitive + negitive = positive negitive + positive = negitive
It can be written as a fraction, so it is rational. It is not an integer, whole number or irrational.
It becomes positive, same thing as negative x negative.
No integer is an irrational number. An irrational number is a number that cannot be represented as an integer or a fraction.All integers which are whole numbers are rational numbers.
No by definition a decimal number can never be an integer because an integer is a whole number (it can not have any decimal parts).