book Maths Puzzle Numerical Ability

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?

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book Other Question

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 Please help - getting stuck with this absolute value problem:

2x+3>= -13