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21 November, 14:19

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

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  1. 21 November, 16:29
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    A = 3400t + 600 | given formula

    21000 = 3400t + 600 | substitute the altitude into the formula

    20400 = 3400 | subtract 600 from both sides

    6 = t | divide both sides by 3400

    6 minutes
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