1. Consider the vectors ū = (-1, –1), ở = (1,2) and w = (3, a). | (a) Find the resultant of u and u. (b) Find the values of a for which i is parallel or is perpendicular to w. (c) Calculate the angle...

Extracted text: 1. Consider the vectors ū = (-1, –1), ở = (1,2) and w = (3, a). | (a) Find the resultant of u and u. (b) Find the values of a for which i is parallel or is perpendicular to w. (c) Calculate the angle between u and v. (d) If A, B and C are points with position vectors ū, i and w (with respect to the origin (0,0,0)), respectively, find a point D so that [ABCD] gives a parallelogram (with vertices labelled clockwise). 6.