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What Are Intervals?

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Definition
Interval on a Number Line
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Intervals as Inequalities
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Interval Notation Using Square Brackets and Parentheses
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Open Intervals
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Closed Intervals
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Half-open Intervals

What Is a Half-Open Interval?

A half-open interval includes one endpoint, but not the other. An infinite interval cannot be half-open at all. Watch this video to learn more.

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    Activity Set 1
    Union of Intervals
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    Intersection of Intervals
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