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30 December, 05:51

The altitude a (in feet) of a plane t minutes after liftoff is given by a=3,400t + 600. How many minutes after liftoff is the plane at an altitude of 21,000 feet?

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  1. 30 December, 07:17
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    6 minutes

    Step-by-step explanation:

    a=3400t+600 substitute 21000 for a

    21000=3400t+600 subtract 600 from both sides

    20400=3400t divide by 3400

    6=t
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