The volume of a rectagular prism is given by
[tex]V=L\times H\times W[/tex]
where L is the length, H is the height and W is the width. By substituting the given values, we get
[tex]\begin{gathered} V=14\times3\times20 \\ V=840in^3 \end{gathered}[/tex]
that is, the answer is 840 inch
