Question #6 help me plz

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great

Which equation can be simplified to find the inverse of y = 2x2^2

Which account has the highest effective annual interest rate? not necessary but show how you got your answer. a. account 1: interest is compounded quarterly at an annual rate of 4.20%.b. account 2: interest is compounded monthly at an annual rate of 4.15%.c. account 3: interest is compounded semiannually at an annual rate of 4.10%d. account 4: interest is compounded annually at a rate of 4.25%.