#### Answer

$\frac{1}{2}$

#### Work Step by Step

We simplify:
$\displaystyle \frac{9}{18}=\frac{3\cdot 3}{2\cdot 3\cdot 3}=\frac{1}{2}$

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Brooks Cole

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$\frac{1}{2}$

We simplify:
$\displaystyle \frac{9}{18}=\frac{3\cdot 3}{2\cdot 3\cdot 3}=\frac{1}{2}$

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