Answer
$S(m)=\frac{600}{2}m^2+5m+CDVDs$;m months since the beginning of the year
Work Step by Step
$S(m)=\int (600 \hspace{1mm}m +5) dm$
$S(m)=\int 600 \hspace{1mm}m + \int5 \hspace{1mm} dm$
$S(m)=\frac{600}{2}m^2+5m+CDVDs$;m months since the beginning of the year