Add: 3.604m + 104.29m + 3.1m + 17.41m.The sum expressed in the correct number of significant figures is
A)13m
B)128m
C)130m
D)128.4m

Question

Quizplus · Accepted Answer

To determine the sum in the correct number of significant figures, we need to add up the numbers without including any insignificant digits.

3.604m has 4 significant digits, 
104.29m has 5 significant digits, 
3.1m has 2 significant digits, 
and 17.41m has 4 significant digits.

The smallest number of significant digits is 2 (in 3.1m), so we need to round the final answer to 2 significant digits.

Adding the numbers gives us:

3.604m + 104.29m + 3.1m + 17.41m
= 128.404m

Rounding this to 2 significant digits gives:

128.4m

Therefore, the correct answer is D.

Add: 3604m + 104