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When one of them is negative and the other is positive.
multiplying and dividing a negative number will "flip" the sign of the other number. So multiplying two negative numbers will produce a positive number. Multiplying one positive and one negative number will produce a negative. And of course two positive numbers yield a positive.
The sum of two numbers depends on their signs and relative magnitudes.Both positive: sum positive Both zero: sum zero Both negative: sum negative Larger magnitude positive, smaller magnitude negative: sum positive Larger magnitude negative, smaller magnitude positive: sum negative Same magnitude, one positive and other negative: sum zero.
It is a positive. When you multiply a negative and a negative, it becomes a positive, then you multipy the positive with the other positive
The set of positive integers contains 1 but not zero. Within the set of integers, there is the subset of positive integers, the subset of negative integers and the subset with a single element in it - zero. There are a zillion other sets that could be specified that meet the conditions set down in the question. The one cited is an easy one.