Question: A stone is thrown vertically upward from a cliff into a river below. The flight of the stone is modeled by the equation y= -(x-12)(x+7)

A stone is thrown vertically upward from a cliff into a river below. The flight of the stone is modeled

by the equation y= -(x-12)(x+7) , where y is the height of the stone above the surface of the water, measured in metres, and x represents the distance it travelled horizontally, in metres,

a) Determine the height of the stone before it is thrown.

b) How far has the stone travelled horizontally when it hits the surface of the water?

c) What is the height of the stone when it has travelled a horizontal distance of 3 metres?

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