Please help me out this is due

Which expression gives you the distance between the points (5,1)and(9,-6)

Plz hurry evaluate the expression a+b where a=8 and b=19

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.