book Maths Puzzle Numerical Ability

a 15 foot ladder is placed against the wall of a house such that the botton of the ladder is at a distance of 10 feet from the wall. at what height does the ladder touch the house?

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I think I have the right answer but does 3a x 4b = 12ab? Thanks very much If the first side of a triangle is 3/4x, the second side is 1/x^2 and the third side is 5/x^2, find an expression that represents its perimeter.