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Problem
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.