exam Maths Puzzle Numerical Ability

solve. a) 1/4x+15- 1/x^2-9=5/x-3 b)sqrt of x+7 +sqrt of x+16=9

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Lauren wants to mix 5 liters of 7% milk with skim-milk (0% fat) to profud a mixture of 2 46/47% milk. How much skim-milk should Lauren add? x axis; (-3,6) find the equation of the parabola having its vertex at the origin, its axis of symmetry as indicated and passing through the indicated point.