How do you do question b?

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

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.