book Maths Puzzle Numerical Ability

1. x+2x-4+5(2x-4)-2=13

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book Other Question

What is a number called that is raised to the second power? Multiply the following fraction.

2x^2 - x - 3/3x^2 + 7x + 4 times 3x^2 - 11x - 20/4x^2 - 9

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