Question

(a)The set of integers is not closed under _________________.
(b) { ( - 4 ) x ( - 5) } + { ( - 6 ) x ( - 7 ) } = _________

Answer 1

Hey

Here is your answer,
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(a)The set of integers is not closed under THE OPERATION OF DIVISION.

For example, 4 and 9 are both integers, but 4 ÷ 9 = 4/9. 4/9 is not an integer, so it is not in the set of integers!
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(b) { ( - 4 ) x ( - 5) } + { ( - 6 ) x ( - 7 ) } = 20 + 42
= 62
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Hope it helps you!