He coud walk 5 meters in one hour because i did 60-12-12-12-12 and then you have a extra 12 so he got 5 meters in one hour part b he can 1 more further because 1 meter because before it was 12 hope explained it right
8n-28
4(2n-7)
you cant factor this. There are no powers
You can find a common denominator using the two denominators multiples.