Tali and malik are playing a game with complex numbers. if tali has a score of 8 – 4i and malik has a score of 7 + 5i, what is their total score?
1 – i
1 + i
15 + i
15 – i

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.