A ladder 26 ft long leans against a vertical wall. If the lower end is being moved away from the wall at the rate of 3 ​ft/sec, how fast is the height of the top changing​ (this will be a negative​ rate) when the lower end is 10 feet from the​ wall? The height of the top is changing at a rate of *blank when the lower end is 10 feet from the wall.

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