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An interval is a range of numbers between two given values. It can be either closed, open, or half-open depending on whether the endpoints are included.
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Inequality: A mathematical statement that compares two expressions using symbols like <, >, ≤, or ≥.
Absolute Value: The distance of a number from zero on the number line; always non-negative.
Number Line: A visual representation of numbers arranged in order along a straight line.