exam Maths Puzzle Numerical Ability

This problem is in the chapter 8 review part #62. I don't understan how to find the perioic rate. The question is: If the number of payments in the present value of an ordinary a

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Please help me to simplify each complex fraction and reduce each answer to lowest terms:

42) 1/3+1/y over y/3-3/y


and

50) ab+b^2/4ab^5 over a+b/6a^2b^4


Thank you very much! what is e squared - 10e+21=0