## College Algebra 7th Edition

a) $2$ b) $-1$
a) $|-6|=6$ and $|-4|=4$. Therefore, $||-6|-|-4||=|6-4|=|2|$. Since $2$ is positive, $|2|=2$. b) $|-1|=1$. Therefore, $\frac{-1}{|-1|}=\frac{-1}{1}=-1$