I am confused about number 2, 3 and 4...Can someone lend me a hand??

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.

Which is the focus of a parabola with equation y2=4x

What is the point slope form of a line with slope -5 that contains point (2,-1)