What are you trying to ask. I am good at graphing so if I understand the question I can help
0.571 as a fraction is 571/1000
The student simplified wrong because when he brought a to the numerator, he forgot to change the sign of the exponent. Instead of getting a^2 in the numerator (by adding 4 + -2), he should have gotten a^6 (by adding 4 + 2)