Volume of a rectangular prism:
[tex]V=l\cdot w\cdot h[/tex]l= length
w= width
h=height
For the given prism:
l=12yd
w=10yd
h=5yd
[tex]\begin{gathered} V=12yd\cdot10yd\cdot5yd \\ V=600yd^3 \end{gathered}[/tex]Then, the volume of the given prism is 600 cubic yards