exam Maths Puzzle Numerical Ability

x to the 2nd + 7x + x to the 2nd - 4x
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x to the 2nd - 5x x to the 2nd - 5x

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exam Other Question

Find the slope of the line passing through the points (0, -3) and (-7, 1). how many ounces of pure water must be added to 75 ounce of a 20% salt solution to make a salt solution which is 15% salt?