What are the factors of 38

Witch represents the inverse of the function f(x)=1/4x-12

Find the nonpermissible replacement for binthis expression.b2/5b +5

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.