plz help ill give u brainlist

Sense this would be known to be a 'prism', we would them do the following key point:

[tex]l*w*h [/tex]

Therefore, we would then multiply to following numbers which would be above.

[tex](5*4*3=60)[/tex]

Question #2.

The reason to why we would us 'square units' to answer in a area format would be because by doing so, it would then describe the surface of the area. And by knowing what you are measuring something by would be a whole lot easier.