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Mathematics, 30.06.2019 21:40 johniyabrown26

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 m...

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