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A helicopter drops an aid package. The height of the package above the ground at any time is modelled by the quadratic relation h =

A helicopter drops an aid package. The height of the package above the ground at any time

is modelled by the quadratic relation h = - 5 t2 - 30 t + 675 , where h is the height in

metres and t is the time in seconds. How long will it take the package to hit the ground?

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