it says that the angle on top is 221, so you subtract that from 360,
360-221= the rest..... 139 Now in that 139, you can see that there is a triangle with a right angle. so you can subtract 90 degrees from 139
139-90= 49 49 is the number you use to solve the rest. 3x + 4x = 7x so 7x = 49 and then you divide 7 from both sides to isolate x, and you get your answer
First we combine the parenthesis to get 9/(-2-i) then we multiply both the numerator and the denomenator by the conjugate of -2-i (whic is -2+i) to get (-18+9i)/5
