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A missile is fired and its distance (in metres) above the ground is given by the function d(t) = -4t + 120t %3D where

A missile is fired and its distance (in metres) above the ground is given by the function d(t) = -4t + 120t %3D where tis the time (in seconds). When does the missile hit the ground? What is the maximum height of the missile? (15 marks)

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