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Mathematics, 17.04.2020 23:28 xxaurorabluexx

A hot air balloon rising vertically is tracked by an observer located 4 miles from the lift-off point. at a certain moment, the angle between the observer's line-of-sight and the horizontal is π4 , and it is changing at a rate of 0.1 rad/min. how fast is the balloon rising at this moment?

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