Answer:
4 miles in one hour
8 miles in 2 hours
12 miles in 3 hours
multiply 4 by 3
because if he walks 4 miles every one hour he walks three times 4 miles in 1 hour.
hope this helps
Step-by-step explanation:
4x + 2 + 12x + 17
= 4x + 12x + 2 + 17
= 16x + 19