1.) 50 @ 45 + 50 @ -135 = 0 

2.) 50 @ 45 * 50 @ -135 = 2500 @ -90

3.) (30 @ 90)/(10 @ -100) = 3 @ 190

4.) (6+j4)(9+j3) = 42 + j54

5.) (6+j4)+(9+j3) = 15 + j7

6.) (7-j3)(j5) = 15 + j35

7.) Z = 90 + j120

	I = V/Z

	I = (750 @ 30)/(90 + j120) = (750 @ 30)/(150 @ 53.13) = 5 @ -23.13 Amps