book Maths Puzzle Numerical Ability

I would like to know if this cite is free,It asked for a registration number& pass word.I was not sure if I could be a member.


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Express the following as a complex number in the form a + ib:

The complex conjugate of i4n-3</sup>, with n Î</font> Z

Please show you working out, and thank you in advance for your help
solve Inx-1.456. Round answer to 4 decimal places