Adding Complex Numbers

1. (3 + 4i) + (7 - 9i) =

 10 - 5i

 10 - 5i

 10 + 13i

2. (2 - 5i) + (8 - 6i) =

  10 - i

  10 - 11i

  10 + i

3. (6 + 10i) + (7 + 4i).

  13 + 14i

  13 + 40i

  13 - 40i

4. (12 + 6i)  +  (4 - 8i).

 16 + 2i

 16 - 2i

 16 - 14i

5. (1 + i)  +  (7 - i)

 8

 8 + 2i

 8 - 2i

6. (9 + 30i)  +  (17 + 5i).

 26 + 35i

 35 + 26i

 26 + 20i

7. (65 + 19i)  +  (-65 + 8i)

 130 + 27i

 130

  27i

8. Solve for x and y such that the statement  4 + yi = x + 9i   is true.

 x = 4, y = 9

 x = 9, y = 4

 Not enough information.

9. Solve for x and y such that the statement  -6 + yi = x + 12i   is true.

 x = 6, y = 12

 x = -6, y = 12

 Not enough information.