Doug regularly mows his neighbor's lawn. Doug's neighbor paid him $55 for 6 hours
of mowing.

Since you are rounding to the nearest whole (the ones-place-digit), look at the tenths digit (the digit right after the decimal point)

In this case it is a 5. If the number is 5 or greater (like the number given) you will round up

37.52 will become 38

If it is 4 or lower, round down. So for example, if it is 37.49, then your answer will be 37 (if you are still trying to find a nearest whole)

So 38 is your answer

hope this helps