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Mathematics 13 Online
OpenStudy (anonymous):

Graph the set and express it in interval notation. All real numbers between 8 and 12, including 12.

OpenStudy (anonymous):

Typically we represent the set of real numbers using a line called the *real number line*:|dw:1366407913366:dw| Since it extends infinitely far in either direction, and each part looks the same, we can use this particular shown part to represent a section of the reals that contains both 8 and 12, marked by dashes:|dw:1366407999015:dw|Since we're interested in the real numbers between them, we shade the line segment between them:

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