This exercise concerns the definition of absolute values. Evaluate the following expressions. These answers must each be simplified to a single number.

$|-4|=$
$-4-|-6|=$

If $4<x$, simplify the expression by removing the absolute sign
$|4-x| =$

If $y<-6$, simplify the following expression as much as possible

$\displaystyle \frac{|y+6|}{y+6} =$