item 5\nperform each calculation to the correct number of significant figures.\npart a\n84.4 + 9.888 + 2.9 +…

Explanation:

Step1: Perform the addition

$84.4 + 9.888+2.9 + 10.77=107.958$

Step2: Determine significant - figures for addition

For addition, we look at the decimal places. 84.4 has one decimal place, 9.888 has three decimal places, 2.9 has one decimal place, and 10.77 has two decimal places. We round to the least number of decimal places among the numbers being added, which is one decimal place.

Step3: Round the result

Rounding 107.958 to one decimal place gives 108.0

Answer:

108.0