exam Maths Puzzle Numerical Ability

questions----- Evaluate 2x-3y when x=-5 and y=-4 ?

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6p5 + 4p3 - 8p4 + 10p2. Please show me how to solve? (Exponents and Polynomials) f(x) = -0.019x^2 + 3.04x - 58.87 describes newspaper circulation (in millions) in the US for 1920-1998 (x = 20 for 1920). When did the circulation approximate 45 million?