The inequality begins with the flat fee of $25. We then add the $13 per day for insurance as 13<em>d</em>, where <em>d</em> is the number of days. This gives us the expression 25 + 13<em>d</em>. Since he only has $121, we must use less than or equal to for our inequality; he can't spend any more than $121, but he can spend any number below it up to that number. This gives us 25 + 13<em>d</em> ≤ 121<em />
