The rectangular flower box is basically a rectangular prism. The volume of a rectangular prism is given by:
[tex]V=l\cdot w\cdot h[/tex]Where:
l = Length or long = 22in
w = width = 7in
h = height
V = Volume = 1232
Solve for h:
[tex]\begin{gathered} h=\frac{V}{l\cdot w} \\ h=\frac{1232}{22\cdot7} \\ h=\frac{1232}{154} \\ h=8in \end{gathered}[/tex]