Using percentage concepts, it is found that Mrs. Rowan percent error is of 40%.
In this problem:
The percent error is:
The percent error is of 40%.
A similar problem is given at brainly.com/question/16903296
Step-by-step explanation:
Percent error = |actual − theoretical| / actual × 100%
|42 − 30| / 42 × 100% = 28.6%
Answer: (4,-38) i think