exam Maths Puzzle Numerical Ability

simplify: 3 square roots of(2/7) - 5 square roots of(7/2) + 3 square roots of 56.

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"The exact average of a set of six test scores is 92. Five of these scores are 93, 95, 96, and 88. What is the other test score?" complete the square, and find the roots of the quadratic equation
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x2 + 16x = 0