The volume of the rectangular prism is 1 [tex]inch^{3}[/tex], If the rectangular prism have a length  of 2 inches, a width of 1 inch, and a height of 1/2 inch.
Step-by-step explanation:
           The given is,
                Let, l - Length of the rectangular prism
                      w - Width of the rectangular prism
                      h - Height of the rectangular prism 
Step:1
         From the given,
                     l - 2 inches
                    w - 1 inch
                    h -  [tex]\frac{1}{2}[/tex] inch
Step:2
        Formula for the volume of a rectangular prism is,
                  [tex]V = w h l[/tex]
       Substitute the values of the w, h and l
                      = ( 1 × [tex]\frac{1}{2}[/tex] × 2 )
                      = 1 
                 V = 1 [tex]inch^{3}[/tex]
Result:
         Thus the volume of the rectangular prism is 1 [tex]inch^{3}[/tex], for the given  rectangular prism have a length  of 2 inches, a width of 1 inch, and a height of 1/2 inch.