Question
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When performing the calculation \( (209.6-116.81) / 8.3922 \), what is the correct answer, to the proper number of significant figures? 11.06 11.057 11 11.1 11.0567

Ask by Ramos Macdonald. in the United States
Feb 24,2025

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Tutor-Verified Answer

Answer

The correct answer is 11.06.

Solution

Calculate the value by following steps: - step0: Calculate: \(\frac{\left(209.6-116.81\right)}{8.3922}\) - step1: Remove the parentheses: \(\frac{209.6-116.81}{8.3922}\) - step2: Subtract the numbers: \(\frac{92.79}{8.3922}\) - step3: Convert the expressions: \(\frac{\frac{9279}{100}}{\frac{41961}{5000}}\) - step4: Multiply by the reciprocal: \(\frac{9279}{100}\times \frac{5000}{41961}\) - step5: Reduce the numbers: \(3093\times \frac{50}{13987}\) - step6: Multiply: \(\frac{3093\times 50}{13987}\) - step7: Multiply: \(\frac{154650}{13987}\) First, let's perform the calculation step by step: 1. **Calculate the numerator**: \[ 209.6 - 116.81 = 92.79 \] 2. **Now, divide by the denominator**: \[ \frac{92.79}{8.3922} \approx 11.056696 \] Next, we need to determine the correct number of significant figures for the final answer. - The number \( 209.6 \) has **4 significant figures**. - The number \( 116.81 \) has **5 significant figures**. - The number \( 8.3922 \) has **5 significant figures**. When performing calculations, the result should be reported with the least number of significant figures from the numbers involved in the calculation. In this case, the least number of significant figures is **4** (from \( 209.6 \)). Thus, we round \( 11.056696 \) to **4 significant figures**, which gives us \( 11.06 \). Therefore, the correct answer is **11.06**.

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The Deep Dive

When performing the calculation \( (209.6 - 116.81) \), you first need to consider the significant figures. The number 209.6 has four significant figures, and 116.81 has five. Therefore, the result of the subtraction will be rounded to three significant figures, giving you \( 92.79 \). Now, dividing \( 92.79 \) by \( 8.3922 \) (which has five significant figures) results in \( 11.058 \). Rounding this to three significant figures (to keep the least count from the subtraction) gives you \( 11.1 \). So the correct answer is \( 11.1 \). When dealing with significant figures, it’s important to remember that the final answer should reflect the least precise measurement from the calculations involved, so rounding appropriately is vital. One common mistake is forgetting to account for the number of decimal places in subtraction, leading to incorrect rounding in the final result. Keep an eye on those significant figures!

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