Final answer:
To answer the student's question accurately, the correct numbers need to be provided as there is a typographical error in the question. The sum of two whole numbers will also be a whole number, considering the rules of significant figures and rounding.
Step-by-step explanation:
The question appears to be asking for the sum of two numbers, but there's a typographical error which makes it unclear what the second number in the problem actually is. To properly answer the question, we would need the correct numbers. However, I can provide you witha a general explanation on how to calculate the sum of two numbers. Let's use the numbers from one of the examples:
To find the sum of 4200 and 540, you would add the two numbers together:
The total sum is 4740. When adding numbers, if they are whole numbers (no decimal places), your answer should also be a whole number. This is an example of using proper significant figures and rounding in addition.