The level of difficulty of these problems varies wildly. Some are entirely appropriate for a high school course. Others definitely inappropriate.

Although problems are categorized by topics, this should not be taken very seriously.

Problem 2 (5 points). Let L1 be the line in R3 through the points 2 1 P = 9 and Q = 7 9 6 Let L2 be the line in R3 with parametric equations :1: = 7 + 275 y : 1 t z=4+t (See Chapter 4.1 of the textbook.) (a) Find parametric equations of the line L1. (b) Determine if L1 and L2 intersect. If so, nd their intersection point .9