book Maths Puzzle Numerical Ability

The question is as follows: 2x^4 - 5x^2 +2=0 ,I factored the equation after replacing the x with p, which came to (2p-1)(p-2). Therefore p=1/2 and p=2.Then replacing P with x^2, x

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Can someone tell me if this is right? What is the slope of the line that has the equation 4x + 2y =12? Is the right answer 2????? Please let me know? Could you show me an algebraic inequation in it's simplest form for the following:

I can purchase 250g of mild cheese for $3.00 or 250g of mature cheese for $3.50. What possible