book Maths Puzzle Numerical Ability

how can i find the argument of (1+i)^13/(1-i)^7

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book Other Question

I need to simplify the expression the square root of 96/8? This is also a multiple choice A.4 to the square root of 3/ the square root of 2 B.2 to the square root 3 C. the square IS EACH EQUATION A DIRECT VARIATION? IF IT IS, WHAT IS THE CONSTANT OF VARIATION?
A. Y= 5/8X
B. 3Y=8X
C. X+5Y=10