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7 September, 05:53

The distance, d, in kilometres, travelled by a plane after t hours can be represented by d (t) = - 4t³=40t²+500t, where t is greater than or equal to 0 and less than or equal to 10. How long does the plane take to fly 4088 km?

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  1. 7 September, 07:09
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    D (t) = - 4t^3 + 40t^2 + 500t = 4088

    4t^3 - 40t^2 - 500t + 4088 = 0

    t = 7

    Therefore, the plane has flown 4088 km 7 hours after it took off.
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