The weight w (in tons) of fuel in a rocket after launch is w 2000 t 2 140t, where t is the time (in min) During what period of time is the weight of fuel greater than 500 tons

Question: The weight w (in tons) of fuel in a rocket after launch is w = 2000 t 2 140t, where t is the

The weight w (in tons) of fuel in a rocket after launch is w = 2000 − t² − 140t, where t is the time (in min). During what period of time is the weight of fuel greater than 500 tons?

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