B
1) GIven the following information we can write out:
The Volume of a Rectangular Prism is equal to
[tex]V=a\cdot b\cdot c[/tex]
2) Plugging into them the given dimensions we can state, expanding the factors:
[tex]\begin{gathered} V=4x^{-2}y^4\cdot1.5x^2y^{-3}\cdot3xy^{-1} \\ V\text{ =18}x^{-2+2+1}y^{4-3-1} \\ V=18x^{}y^{4-4} \\ V=18xy^0 \\ V=18x \end{gathered}[/tex]
Note that we applied the exponent's rule to operate them.
3) Hence, the volume of that rectangular prism is 18x cubic units
