exam Maths Puzzle Numerical Ability

Solve the quadratic equation by completing the square.

x^2-6x-3=0

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exam Other Question

Find the variation constant and an equation of variation where y varies directly as x and y=8 when x=4.
The variation constant is k=_.
The equation of variation is y=_ Angela needs 20 quarts of 50% antifreeze solution in her radiator. She plans to obtain this by mixing some pure antifreeze with an appropriate amount of a 40% antifreeze solution. How many quarts of each should she use?