Can someone please tell me how to get from that to that? Is it factorization or something? I’m really dumb

They multiplied the 4's to get 16.

For the X part, 1 of the X's got cancelled out.

So like this:

X divided by X² would leave you with an extra X.

A) 144.44 sq inches i believe

Skew lines(segments) are lines(segments) in 3 dimensions that do not intersect the given segment and are not parallel to it.  ae, bf, eg, and fh are your skew segments.  i hope that : )