5x + 10y + 5z. Distribute the .5 to the number in the parentheses. It basically just cuts the numbers in half.
Skew lines are not parallel and do not intersect.
Lines PQ and JN are neither of those so are skew.
Parallel lines are the same direction and do not intersect
Lines KJ and LM are parallel.
The answer is 144.0833333333
5 1/4? Im not sure what the question is asking but whatever