To find Teresa's percent error, we can use the following formula for percent error:
\[ \text{Percent Error} = \left( \frac{|\text{Estimated Value} - \text{Actual Value}|}{\text{Actual Value}} \right) \times 100 \]
Step 1: Identify the values
- Estimated Value = 18 feet
- Actual Value = 16 feet
Step 2: Calculate the absolute error
\[ |\text{Estimated Value} - \text{Actual Value}| = |18 - 16| = 2 \text{ feet} \]
Step 3: Calculate the percent error
Now, substitute the values into the percent error formula:
\[ \text{Percent Error} = \left( \frac{2}{16} \right) \times 100 \]
Step 4: Perform the division
\[ \frac{2}{16} = 0.125 \]
Step 5: Multiply by 100 to convert to percentage
\[ \text{Percent Error} = 0.125 \times 100 = 12.5% \]
Final Answer
Teresa’s percent error is 12.5%.
This rounds to the nearest tenth as 12.5%.