Explain why a three dimensional figure with a curved surface is not a polyhedron

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

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.

To decrease an amount by 16% what single multiplier would you use