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Mathematics 9 Online
OpenStudy (anonymous):

Express the set W={z|z<4 or z>9} using interval notation.

OpenStudy (perl):

Let me give you a similar problem, which you can use as a guide. Express the set W={z|z<3 or z>10} using interval notation: $$\Large (-\infty,3 )\cup (10,\infty)$$

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