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I think its d.
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i got c?
does any one actually know how to do this?
yes. the key is knowing what the various symbols mean. [ ] mean include the endpoints, and ( ) mean all but the endpoints.
\[[a,b]\]is the same as \[a\le x \le b\]because we include the endpoints of \(a\) and \(b\)
\[(a,b)\]is the same as \[a \lt x \lt b\]because we do not include the endpoints
You can see a decent video on this topic at https://www.khanacademy.org/math/algebra/algebra-functions/domain-and-range/v/introduction-to-interval-notation
I forgot to mention that you can of course mix and match the symbols as needed. I agree with your choice of C as the correct answer.