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A company must lay a cable between two points A and B that are separated by a river 1000 feet wide. Suppose that A is

A company must lay a cable between two points A and B that are separated by a river 1000 feet wide. Suppose that A is also 1000 feet west of B. If it costs $15 per foot to lay cable underground and $25 per foot to lay it underwater, what is the most economical way to lay the cable?

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