Read and $aaaly2e$ each situation carefully and apply $y$ your learnings on $xepxe8eaimg$
$\pi ea1-H\pi e$ situations involving functions including piecewise.
$1.$ Contaminated water is subjected to a cleaning process. The concentration of the
pollutants is initially $5$ mg $2$ per liter of water. If the cleaning $B$ process $C$ can reduce the
pollutant by $10%$ each hour, $leGme$ $9$ function that $Q$ can represent the concentration
of pollutants in the water in terms of the number of hours that the cleaning $Pxoo6ss$
has taken place.