Answer :
[tex]\begin{gathered} V\text{ = }\begin{cases}1500\text{ + 60 t; }0\text{ }\leq\text{ t }\leq\text{ }30 \\ 130t\text{ - 600; }30\text{ }<\text{ t }\leq\text{ 60}\end{cases}\text{ } \\ \end{gathered}[/tex]
Now we graph the piecewise defined function:
