exam Maths Puzzle Numerical Ability

please help:what is the equation of the axis of symmetry of the graph y=3x^2+12x-2

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exam Other Question

(y/x)^a = b*e^-x a track is in the shape of a rectangle and two semicircles . the ractangle is 4 yards by 10 yards to the nearest yard what is the perimeter if the track