First, we need to know how many miles he walks in one day. To do this we must do the following:
[tex] \frac{18000}{3500} =5.14miles[/tex]
Now that we know he walks 5.14 miles per-day we would multiply that by the number of days in a year, or 365.
[tex]5.14 *365=1846[/tex]
So Nick walks about 1,846 miles in one year.