7) Given that the points 4 = (-1,4,0), B = (2,1,1), C=(2,-2,1) are three vertices of the parallelogram ABCD, find [10 MARKS] a) The fourth vertex D. b) Determine the angles by using the dot product. Round the answer to the nearest one decimal place. c) The area of the parallelogram ABCD. Round the answer to the nearest one decimal place. 8) Determine an equation of a line that passes through the point P(5, -2,3) and is parallel to the line of ntersection of the planes m:x + 2y - z =6 and my: y + 2z = 1 [8 MARKS]