a. Emma completed the problem correctly.
b. Erin incorrectly raised 6 to the 10th power instead of 6 to the 11th power (since 6 to the 5th power multiplied by 6 squared equals 6 to the 11th power). Eden also made a mistake and raised 6 to the 7th power instead of 6 to the 12th power (since 6 to the 5th power multiplied by 6 squared equals 6 to the 11th power, and then squaring that result gives 6 to the 12th power).