Answer:
Correct answer to (5^2)^1: 25
Likely error: Your classmate added the exponents 2 and 1 together, and solved 5^3.
Explanation:
A number to the power of 1 is the same number. It is not multiplied by anything. To solve (5^2)^1, first solve 5^2, what's within the parenthesis. 5^2=25, because 5*5=25. 25^1 is 25, because putting a number to the power of 1 results in the same number.