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
2x+79+32=180
2x+111=180
2x=69
x=34.5
The amplitude of this function is 4/5. Be sure you understand why that is so.