we know that
the volume of a rectangular prism is equal to
V=L*W*H
1) Find the volume of the first and second rectangular prism
![V=2*(8*6*3)=144\ in^(3)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/ypvliqn0w8k2nsyehin0chhmwebnnnyvqr.png)
2) Find the volume of the third rectangular prism
![V=6*4*10=240\ in^(3)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/1e6wngjq0uz76tlogjloz803bm7m1j7wf1.png)
1) Find the total volume of the structure
![V=144+240=384\ in^(3)](https://img.qammunity.org/2019/formulas/mathematics/middle-school/98z5dk61qj7s3eygxmpnaqvigkxchfh3pm.png)
therefore
the answer is
the total volume of the structure is
![384\ in^{3](https://img.qammunity.org/2019/formulas/mathematics/middle-school/9wmawhih60ifg87im4h4dmq5ug0zzsn49w.png)