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Select the answer with the correct number of significant figures for the following calculation:

[tex]31.580 + 4.26 =[/tex]

A. 35.8
B. 35.84
C. 35.840

Answer :

To solve the problem of determining the correct number of significant figures in the addition of 31.580 and 4.26, follow these steps:

1. Understand Significant Figures in Addition:
- When performing addition, the number of decimal places in the result should match the number with the fewest decimal places from the numbers being added.

2. Identify Decimal Places:
- The number 31.580 has three decimal places.
- The number 4.26 has two decimal places.

3. Add the Numbers:
- Add the numbers: [tex]\(31.580 + 4.26 = 35.840\)[/tex].

4. Determine the Correct Number of Decimal Places:
- Since 4.26 has the fewest decimal places (two decimal places), the result should also have two decimal places.

5. Round the Result:
- The result 35.840 should be rounded to two decimal places, which gives us 35.84.

Thus, the correctly rounded answer with the proper significant figures is 35.84.

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