Please help if you can

Solve the equation by completing the square. x^2+2x=17

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

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.