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11 February, 08:58

The altitude a (in feet) of a plane t minutes after liftoff is given by a=3400t+600. How many minutes after liftoff is the plane at an altitude of 21,000 feet?

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  1. 11 February, 10:45
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    21,000-600 = 20,400

    20,400/3400 = 6

    t = 6

    21,000=3,400 (6) + 600

    21,000=20,400+600

    21,000=21,000

    34.00

    *6

    __

    204.00

    3,400*6=20,400
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