exam Maths Puzzle Numerical Ability

factorial for X^2-2x^2y^2+y^4. can anyone solve it.

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exam Other Question

Randy and Amy left school at the same time and began walking in opposite diretions. Randy walked at a rate of 3.6 km/h and Amy walked at a rate of 4.2 km/h. How far apart were they after 10 minutes. (squareroot 2x)squareroot3x)(squareroot6)