A billboard 10 feet high is located on the edge of a building 45 feet tall....

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A billboard 10 feet high is located on the edge of a building 45 feet tall. A girl 5 feet in height approaches the building at the rate of 3.4 ft/sec. How fast is the angle subtended at her eye by the billboard changing when she is 30 feet from the billboard? A billboard 10 feet high is located on the edge of a building 45 feet tall. A girl 5 feet in height approaches the building at the rate of 3.4 ft/sec. How fast is the angle subtended at her eye by the billboard changing when she is 30 feet from the billboard?

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