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

10) The year y when sales were s million dollars for a particular electronics company can be modeled by the radical equation
. . . . . ______
y=1.3/s-4-7 (That is the sqrt s A designer, attempting to arrange the characters of his artwork in the form of a square grid with equal number of rows and columns, found that 24 characters were left out. When he