exam Maths Puzzle Numerical Ability

Please solve the formula pr=i/1+i for i

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exam Other Question

Solve, expressing answer in exact form.
[(e^x)^3 * (e^x)^2x] / e^5 = 1 Hey everyone this is a complex fraction.
x/4 - 4/x
________
1 - 4/x

My solution is: x+4/4

Thanks for your help.