$$10 \cdot \frac { - 9 } { 4 }$$
$-\frac{45}{2}=-22.5$
$$10\left(-\frac{9}{4}\right)$$
$$\frac{10\left(-9\right)}{4}$$
$$\frac{-90}{4}$$
$$-\frac{45}{2}$$
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$-\frac{45}{2} = -22\frac{1}{2} = -22.5$