exam Maths Puzzle Numerical Ability

please help me with this one.
multiply(3x-27)/(x^2-10x) by 6x/(9-x)

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exam Other Question

Angela calculates the sum of the interior angles of a regular 13-gon by multiplying 13 by 180 degrees to arrive at 2340 degrees. What mistake has Angela made and what is the correc Graph y=|x| and y=-|x| with a statement