The cross-section of a satellite dish mounted to a wall is in the shape of a parabola. If x is the horizontal distance from the centre of the dish and y is the vertical distance from the wall, the equation for the cross section is given below, where all measurement are in centimetres. Find the distance from the wall of a point on the cross-section that is at a horizontal distance of 5 cm from the centre of the dish, to the nearest tenth of a centimetre.

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