exam Maths Puzzle Numerical Ability

what is e squared - 10e+21=0

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exam Other Question

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 I dont have any clue as to what i need to do for this problem.
(x^3*x^4/x^2)^6