Answer :
Check the picture below.
[tex]\textit{volume of a cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ r=2.5\\ h=30 \end{cases}\implies V=\pi (2.5)^2(30)\implies V\approx 589.05~ft^3[/tex]
Check the picture below.
[tex]\textit{volume of a cylinder}\\\\ V=\pi r^2 h~~ \begin{cases} r=radius\\ h=height\\[-0.5em] \hrulefill\\ r=2.5\\ h=30 \end{cases}\implies V=\pi (2.5)^2(30)\implies V\approx 589.05~ft^3[/tex]