To round the trip distance to the nearest ten, you would look at the digit in the ones place, which is 1 in this case (4,521). When rounding to the nearest ten, if the ones digit is 5 or more, you round up. If the ones digit is 4 or less, you round down.
Since the ones digit here is 1, which is less than 5, you round down. This means that the tens digit stays the same and the ones digit becomes 0. Therefore, the trip distance rounded to the nearest ten miles is 4,520 miles.
The correct answer is 4,520 miles.
