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# Number Lines

## On a number line, values can represent any real number. Number lines are useful dealing with concepts like absolute value, and real numbers.

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Real Number Line Graphs

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### Vocabulary Language: English

Set Notation

Set notation is mathematical notation that describes a set of numbers. Typically, it states a variable and then a condition or conditions for that variable that limits the values that the variable can be. $\{x|x \ge -3, x \ \in \ Z\}$ is an example of set notation.