exam Maths Puzzle Numerical Ability

Express as a polynomial: (x-a)(x^2-ax/x)

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exam Other Question

Sarah leaves Seattle for Newyork in her car, averaging 80mph across open country. 1hr later a plane leaves Seattle for Newyork following the same route and flying 400mph. Howlong before the plane overtake the car? solve:

9/x-5 -1=8/x+5