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A ladder 15 ft long leans against a vertical wall. If the lower end is being moved away from the wall at the rate of

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A ladder 15 ft long leans against a vertical wall. If the lower end is being moved away from the wall at the rate of 4 ftlsec, how fast is the height of the top changing (this will be a negative rate) when the lower end is 9 feet from the wall? E)- The height of the top is changing at a rate of E El when the lower end is 9 feet from the wall. (Simplify your answer.) - ft/ sec sec ft

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