Need help ASAP will give more points

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.

Find a third-degree polynomial equation with rational coefficients that has roots -2 and 6+i

The scale factor of the dimensions of two similar wood floors is 5 : 4. it costs $384 to refinish the smaller wood floor. at that rate, how much would it cost to refinish the larger wood floor?