book Maths Puzzle Numerical Ability

Please help - getting stuck with this absolute value problem:

2x+3>= -13

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book Other Question

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? Jennifer, Stephanie, and Rosalyn made a total of 60 downhill runs. Jennifer made 18 runs and Stephanie made three fourths as many runs as Rosalyn. How many runs did Rosalyn make?