| Question | Answer | Solution |
| 36. |  |
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| 39. |  |
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| 42. | 5 |  |
| 45. |  |
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| 48. |  |
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| 51. |  |
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| 54. |  |
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| 57. | i2 = -1, so -2i2 = 2; 4 - i + 8i - 2i2 = 6 + 7i. |
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| 66. |  |
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| 68a. |  |
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| 68b. |  |
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| 68c. |  |
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| 68d. |  |
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