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6. (3 marks) The cost of laying a bre optic cable underwater is 3 times that of underground. An island is 4 km from point

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6. (3 marks) The cost of laying a bre optic cable underwater is 3 times that of underground. An island is 4 km from point 5' on the shore and a broadcast station, B , is 14 km along the shore, perpendicular to S. How should the cable be laid to keep cost to a minimum

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