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Question: 1is the set z closed under multiplication if your answer...

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1.Is the set Z closed under multiplication? If your answer is yes, provide two (2) typical examples of multiplication of integers illustrating this; if your answer is no, provide one (1) counterexample showing the non-closure.

2. Is the set Q− closed under multiplication? If your answer is yes, provide two (2) typical examples of multiplication of negative rational numbers illustrating this; if your answer is no, provide one (1) counterexample showing the non-closure.

3. Is the set R− closed under subtraction? If your answer is yes, provide two (2) typical examples of a subtraction of two negative real numbers illustrating this; if your answer is no, provide one (1) counterexample showing the non-closure.

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