Find the infinity of -3, 1, -1/3, 1/9

What is the smallest integer n such that n\sqrt{2} is greater than 20

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

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.