Which sequences are geometric ? Check all that apply. 10,7.5,5.625,4.21875
160,40,10,2.5,
20,70,245,857.5
5,5.5,6.05,6.655
16,17.1,18.2,19.3

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.