alleryStart learning →In interval notation, what does a square bracket next to a number mean?
AThat number is left out
BThat number is included
CThat number is negative
DThat number is a limit
Answer & Solution
Correct answer: B. That number is included
1. Interval notation marks each end of a solution set with either a bracket or a parenthesis.
2. A bracket marks an endpoint that belongs to the set, matching a greater than or equal to sign.
3. A parenthesis marks an endpoint left out of the set, and infinity always takes a parenthesis.
_Source: OpenStax College Algebra (CC BY 4.0), section 2.7 Linear Inequalities and Absolute Value Inequalities_
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