Final answer:
To round the sum of 4200 and 540 to the nearest whole number, we get 4740.
Step-by-step explanation:
In this math question, the topic is rounding numbers. We are given the numbers 4200 and 540 and are asked to determine the sum. To round our answer, we look at the decimal places of the starting numbers. Since they both have 0 decimal places, we round the sum to the nearest whole number, which is 4740.