This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.

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Answer
3100
You are correct to point out the formatting. Let's re-do Question 21 with the correct format and option selection.
Question 21: The correct option is (e).
Step 1: Identify the first two significant figures in the number . The first significant figure is . The second significant figure is .
Step 2: Look at the digit immediately following the second significant figure. The digit after is .
Step 3: Apply rounding rules. Since the digit is or greater, round up the second significant figure. The becomes .
Step 4: Replace all digits after the second significant figure with zeros to maintain the place value. The approximation to 2 significant figures is .
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You are correct to point out the formatting. Let's re-do Question 21 with the correct format and option selection.
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.