book Maths Puzzle Numerical Ability

solve using the square root property:
(2x-1)^2 = 12

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book Other Question

A ski lift takes a skier up a slope at 50 meters/min.The skier then skis down the slope at 150meters/min. If one round trip takes 24 mins, how long is the slope? I need the particular function f(x)=1/(sqrt1-x^2) graphed but i don't understand what or how to graph something like this?