book Maths Puzzle Numerical Ability

A 15 foot ladder is leaning against a wall. It's base is moving at a constant rate of 2 ft per second away from the wall. What is the rate of change of the area formed by the lad

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Hi! i'm stuck on this problem. Radical and fractional exponents
(3{{{SQRT}}2- 2{{{sqrt}}}3) ^3.

thanks I have been out of school for a long time and am studying for a test to get a job. I have forgotten how to solve algebraic equations! I never was very good at it anyway. I am havin