Solution:
The cost to fill the propane tank is modeled by the function;
[tex]\begin{gathered} C(g)=3.37g \\ \\ \text{ Where }C=cost(\text{ \$})\text{ and }g=gallon\text{ \lparen of gas\rparen} \end{gathered}[/tex]
The practical domain of this function is;
[tex]0\leq g\leq17[/tex]
Hence, the range of this function is;
[tex]\begin{gathered} \text{ Minimum cost:} \\ C(0)=3.37(0) \\ \\ C(0)=0 \\ \\ Maximum\text{ cost:} \\ C(17)=3.37(17) \\ \\ C(17)=57.29 \end{gathered}[/tex]
Thus, the practical range is;
[tex]0\leq C(g)\leq57.29[/tex]