Answer:
269.0
Explanation:
Line up your numbers and write the significant figures for each:
13.914 → 5 significant figures
243.1 → 4 significant figures
12.00460 → 7 significant figures
Add your numbers:
13.914 + 243.1 + 12.00460 = 269.01860
Simplify your answer according to your significant figures:
For addition, the rule is to round your answer to the least amount of significant figures in your given numbers. Therefore, we round the answer to 4 significant figures, making the answer 269.0