exam Maths Puzzle Numerical Ability

Graph 3x-y=4

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exam Other Question

How many pounds of walnuts which cost $4 per pound must be mixed with 25 pounds of almonds which cost $7.50 per pound to make a mixture which will cost $6.50 per pound? Find the domain of the rational function:
f(x) = (2x^2 - 4) / (3x^2 + 6x - 45)