Teresa estimates that the height of a giraffe in a zoo is 18 feet. In fact, it is 16 feet tall. What is Teresa's percent error? Use proportional relationships to solve the problem. Be sure to show all your work, provide your answer as a percentage, and round your answer to the nearest tenth. (4 points)
To find the percent error, we use the formula:
\[\text{percent error} = \left|\frac{\text{estimate} - \text{actual}}{\text{actual}}\right| \times 100\]
We have:
\[\text{percent error} = \left|\frac{18 - 16}{16}\right| \times 100\]
Simplifying:
\[\text{percent error} = \frac{2}{16} \times 100\]
And finally:
\[\text{percent error} = 12.5 \% \]