Calculus #3:
1.
a) Let A = (2,4,6),B = (1,2,3) and C = (5,5,5). Find point D so
that ABCD is a parallelogram.
b). Two points X and Y are colinear if they lie on the same
line. Are the points A = (3,6,−1), B = (2,0,3) and C = (−1, 3, −4)
colinear? Justify your answer.