An item is regularly priced at $15. it is now priced at a discount of 55% off the regular price.

If it is marked at 55% off, the u r actually paying 45%

so 45% of 15 = 0.45(15) = 6.75 <== discounted price 

The answer is a good luck

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 : )