book Maths Puzzle Numerical Ability

(8x+2y)-(5x+4y)

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book Other Question

Simplify as simple fraction with all exponents positive:
(x^-3*y^-2*z^-3)-(y^-1*z^-3)/(3*x)-(x^2*y)
2) What is the number of x- and y-intercepts that quadratic functions may have?