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

Question

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

anonymous · Answer

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: