montegal002 montegal002

23-09-2018
Mathematics

contestada

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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happycj03 happycj03

23-09-2018

21,000 = 3400t + 600
20400 = 3400t
6 minutes = t

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