_} a. D If l (1 l : Band 5 | = 13, and the angle between these two vectors is 135 , _} a} determine E} * b . [2 points] > }> b] determine the numerical value of (4? b ) - (8? -I- 3 b ). [3 points] Determine the coordinates of a unit vector that is perpendicular to both _> E} =(1,2, 5)and b = (1, 3, 5)