Three vectors , , and each have a magnitude of 47 m and lie in anxyplane. Their directions relative to the positive direction of thexaxis are 34°, 191°, and 313°, respectively. What are (a) the magnitude and (b) the angle of the vector + + , and (c) the magnitude and (d) the angle of - + ? What are (e) the magnitude and (f) the angle of a fourth vector such that ( + ) - ( + ) = 0?