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Mathematics, 23.04.2020 01:29 trapdee61p3sj8r

A ladder 39 ft long leans against a vertical wall. If the lower end is being moved away from the wall at the rate of 4 ft/sec, how fast is the height of the top changing (this will be a negative rate) when the lower end is 15 feet from the wall?

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A ladder 39 ft long leans against a vertical wall. If the lower end is being moved away from the wal...
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