book Maths Puzzle Numerical Ability

1.x>=0 then sqrt(x)sqrt(x) sqrt(x) is? I NEED A FULL SOLUTION.. PLS.
2.If 60^a=3 and 60^b=5, then 12^1-a-b over 2(1-b) is?

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book Other Question

what is the equation of the line passing through (0,15) perpendicular to the graph of y=-3/4x+2/3???

thanks. Find the area of a fenced yard with a length of 9 yards and width of 5 yards.