**Answer:**

See below ~

**Step-by-step explanation:**

<u>Question 1</u>

- (2 + 3i) + (3 - 4i)
- <u>
**5 - i**</u>

<u>Question 2</u>

- (3 – 5i) – (–2 – i)
- 3 - 5i + 2 + i
- <u>
**5 - 4i**</u>

<u>Question 3</u>

- (2 − 4i)(1+ 3i)
- 2 - 4i + 6i - 12i²
- <u>
**14 + 2i**</u>

<u>Question 4</u>

- 2i(-1 + 3i)
- -2i + 6i²
- <u>
**-6 - 2i**</u>

15 is the answer of this question

1a. 9qt= 2 gal 1 qt2a. 20 oz= 2 C 4 oz3a. 10 C4a. 9360 ft5a. 3 gal 2 qt6a. 137 cm7a. 16 oz8a. 101 oz9a. 12 c10a. 22 cm 6 mm11a. 44 oz12a. 0 gal 2 qt 21 oz1b. 15 oz2b. 3 mi 160 yds3b. 4 qt4b. 3 mi 1560 ft5b. 8320 yd6b. 76 oz7b. 74 oz8b. 914 cm9b. 6240 yd10b. 1 pt 1 c11b. 2 yd 2 ft12b. 24 oz1c. 2,250 ml2c. 8 km 280 m3c. 3 kg 950 g4c. 15720 ft5c. 0 gal 3 qt 3 oz6c. 15 qt7c. 3 km 70 m8c. 17 oz9c. 2 qt 30 oz10c. 16 qt11c. 2400 yd12c. 2 mi 3480 ft