book Maths Puzzle Numerical Ability

Ordering fractions
Use < , >, or = to order the three fraction pairs below
a) 3/8 [ ] 15/40
b) 5/11 [ ] 4/9
c) 11/14 [ ] 3/4

Solving a linear equation with several occuran

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book Other Question

how can i find the argument of (1+i)^13/(1-i)^7 I get confused on how to diversify between putting a negative and positive on problems such as in multiplying, dividing, adding, and subtracting. How do i keep them straight? Is there some kind of way i can keep them apart or at least remember them??