If y=-6.6 when x=9.9 find y when x=6.6.

There is no way to know the answer because we are not told anything about the relationship between x and y.

Here are the answers to the ones that i could see.

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 : )