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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 minutes after liftoff is the plane at an altitude of 21,000 feet?

User LeoNeo
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1 Answer

6 votes
21,000 = 3400t + 600
20400 = 3400t
6 minutes = t
User Andrew Ymaz
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