Does anybody know how to do this?

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?

Triangle knm is what is true about the sides of knm