Which expression is the simplest form of – (2x3 + x² +3 (23 – 4x2) O A. 5.83 – 12.02
O B. 573 11x2
O C. 23 1322
O D. r3 – 3.x2

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.