Kitten_is_back
  • Kitten_is_back
For which operations is the set {–1, 1} closed? Choose all answers that are correct. A. addition B. subtraction C. multiplication D. division
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
If I remember what these questions are about, C, and D are correct. \[-1 \times 1 = -1 \] \[\dfrac{-1}{1} = -1\] Negative one is part of the set. Ergo, closed.
Kitten_is_back
  • Kitten_is_back
so times and subtraction?
anonymous
  • anonymous
Subtraction does not work, since you get 0, and that is not part of the set.

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Kitten_is_back
  • Kitten_is_back
okay so its a c or d we know its c what about addition?
anonymous
  • anonymous
Actually we know it is both, C, and D. Any my bad, with addition we get zero, subtraction gives us -2, which is also not in the set.
Kitten_is_back
  • Kitten_is_back
okay so its just c d?
anonymous
  • anonymous
Addition: -1 + 1 = 0. Subtraction: -1 - 1 = -2
anonymous
  • anonymous
Yes.
Kitten_is_back
  • Kitten_is_back
so b c d?
anonymous
  • anonymous
B gives -2, and the set is only {-1, 1} so no.
Kitten_is_back
  • Kitten_is_back
okay M<# thans

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