The formula of a volume of the box:
[tex]V=lwh\\\\l-length\\w-width\\h-height[/tex]
We have
[tex]l=\dfrac{1}{2}\ feet\\\\w=\dfrac{1}{2}\ feet\\\\h=\dfrac{3}{4}\ feet[/tex]
Substitute:
[tex]V=\dfrac{1}{2}\cdot\dfrac{1}{2}\cdot\dfrac{3}{4}=\dfrac{3}{16}\ feet^3[/tex]
