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Mathematics, 20.07.2021 23:10 nayo2006

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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The altitude a (in feet) of a plane t minutes after liftoff is given by a = 3400t + 600. How many mi...
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