exam Maths Puzzle Numerical Ability

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What is the difference between 2x^2+4xy-3 and x^2xy-4>

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Please help me with this problem: A five-pointed star is inscribed in an irrergular pentagon, how do I find the formula for the sum of it's angles? I tried drawing it in the regula you have at least $30.00in change consisting of dimes and quaters. Write an inequality that shows the differant number of coins