exam Maths Puzzle Numerical Ability

factor pollynomial 16a squared-40ab+25b squared

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the number N, in millions, of hearing imparied individual of age X can be approximated by N=-0.00006x^3+0.006x^2-0.1x+1.8. Approximate to the nearest million the number of hearing imparied individal of ages 25 and 50 Give the focus, directrix, and axis for each parabola
x^2 = 1/8y