book Maths Puzzle Numerical Ability

I'm studying for a math placement test and haven't done Algebra in 15 years. I'm totally stumped on this one:

For all x>0 and y>0, the radical expression: sq. root of x / 3 tim

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I need help solving this problem, please. I haven't taken math in years and I don't even know where to begin. Thanks in advance.

2-(8y-t)/4y+(7y+6t)/3y I am totaly lost with this one guys!!!!

"X" varies directly as the square of "S" and inversely as "T". How does "X" change when "S" is doubled? How does it change when both "S" and "T" are doubled?