If a = 5 and b = -3, what is the value of 2b/b^2-a

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.

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

Two consecutive negative integers have a product of 30. what are the integers?