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Match each interval to what it holds

Exercise and reference answers

Matching pairs
  1. Left
    (a, b)
    Right
    Both endpoints are left out of the set
  2. Left
    [a, b]
    Right
    Both endpoints are included in the set
  3. Left
    [a, b)
    Right
    a is included and b is left out
  4. Left
    (a, b]
    Right
    a is left out and b is included
  5. Left
    (a, infinity)
    Right
    Everything above a, with a left out
  6. Left
    [a, infinity)
    Right
    Everything from a upward, a included
Instructions
Tap an interval, then tap the description of exactly which numbers it lets in.

Explanation

_Source: OpenStax College Algebra (CC BY 4.0), section 2.7 Linear Inequalities and Absolute Value Inequalities_
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