exam Maths Puzzle Numerical Ability

A car CD player has an operating temperature of absoulte value of t-40 degrees < 80 degrees where t is the temperature in degreees Fahrenheit. Express this range without using abso

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please help me with the rational expression. thanks

12x^2-4x-5/8x^2-6x-5 The demand equation for a certain product is p=x(30-0.0005x) where p is the price per unit and x is the number of units sold. The total revenue for selling x units is given by
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