we know that
The volume of the cylinder is equal to
[tex]V=B\cdot h[/tex]where
B is the area of the base and h is the height of cylinder
we have that
[tex]B=\pi\cdot r^2[/tex]we have
pi=3.14
r=4 ft
substitute
[tex]\begin{gathered} B=3.14\cdot4^2 \\ B=50.24\text{ ft\textasciicircum{}2} \end{gathered}[/tex]Find the volume
[tex]V=B\cdot h[/tex]we have
B=50.24 ft^2
h=17 ft
substitute
[tex]\begin{gathered} V=50.24\cdot17 \\ V=854.1\text{ ft\textasciicircum{}3} \end{gathered}[/tex]