Final answer:
To solve the given calculation and round to the correct number of significant figures, add the three numbers and round to the appropriate significant figures.
Step-by-step explanation:
To solve the given calculation and round to the correct number of significant figures, we add the three numbers:
34.683 + 58.930 + 68.35112 = 162.96412
Since the number with the fewest significant figures is the second number, which has four significant figures, we round our final answer to four significant figures: 162.9