exam Maths Puzzle Numerical Ability

Find the value of k that will make the roots of kx^2+4x+12=0

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exam Other Question

I am having problems with this. Need to solve and graph it.

y=x^2-5x-4 or y= 3/4x-2x

using -b/2a (Cigarette Consumption) The worldwide consumption of cigarettes has been increasing steadily in recent years. The number of trillions of cigarettes, y, purchased x years after 196