ANSWER:
12.5 cubic inches
STEP-BY-STEP EXPLANATION:
The first thing to do is calculate the volume of each half-inch block. We calculate this volume by means of the following formula:
[tex]\begin{gathered} V_b=(\frac{1}{2})^3 \\ V_b=0.125in^3 \end{gathered}[/tex]Then we multiply this volume by the number of blocks there are, just like this:
[tex]\begin{gathered} V=100\cdot0.125 \\ V=12.5 \end{gathered}[/tex]The volume of the prism would be 12.5 cubic inches.