anonymous
  • anonymous
Which solution set describes the set of integers less than or equal to -1?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
I'm guessing when they say "Which solution set ", they are offering a list of choices?
anonymous
  • anonymous
Yes! drawing them right now:)

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More answers

anonymous
  • anonymous
|dw:1443324314598:dw|
anonymous
  • anonymous
Sorry about the bad drawing.
jim_thompson5910
  • jim_thompson5910
it's ok
jim_thompson5910
  • jim_thompson5910
the first one has a Z in it?
anonymous
  • anonymous
Yes!
jim_thompson5910
  • jim_thompson5910
the big R means "real numbers" a real number is any decimal number you can think of eg: 2.7562
jim_thompson5910
  • jim_thompson5910
the big Z means "integers". Why didn't they use capital i? well i is reserved for later math courses, so Z is used instead but why Z? It turns out that `Z is for Zahlen - the German word for integers` http://mathforum.org/library/drmath/view/53922.html I guess when the math notation was developed, a German mathematician was the one who came up with the set of integers
anonymous
  • anonymous
-1 wouldn't be a real number? I thought real numbers, were like natural numbers. Example; 1,2,3,4 etc
jim_thompson5910
  • jim_thompson5910
negative numbers are also real numbers eg: -2.87 is a real number
anonymous
  • anonymous
I know I'm wrong. Just looked at my notes.
anonymous
  • anonymous
So its between 2 and 3 then?
jim_thompson5910
  • jim_thompson5910
well we wouldn't use R because we don't want real numbers we want integers
jim_thompson5910
  • jim_thompson5910
we use Z for the set of integers
anonymous
  • anonymous
So number one?
jim_thompson5910
  • jim_thompson5910
|dw:1443238883932:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1443238904937:dw|
jim_thompson5910
  • jim_thompson5910
yeah it's the first one and hopefully you see why based on what I posted above
anonymous
  • anonymous
|dw:1443325104010:dw|
anonymous
  • anonymous
I also have this possible answer.
jim_thompson5910
  • jim_thompson5910
it states ` less than or equal to -1` the key part to look out for is the `or equal to`
anonymous
  • anonymous
And only the first one demonstrates that?
jim_thompson5910
  • jim_thompson5910
the one with \[\Large \{x|x\in\mathbb{Z} \ \text{ and } x \le -1\}\] whichever one that is
anonymous
  • anonymous
Thats the first one:)
jim_thompson5910
  • jim_thompson5910
\[\LARGE \overset{\color{red}{<}}{\color{blue}{\_}} \text{ means } \color{red}{\text{greater than}} \ \color{blue}{\text{or equal to}}\]
jim_thompson5910
  • jim_thompson5910
ok just checking, yeah the first one is the answer

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