The cost of laying a fibre optic cable underwater is 3 times that of underground. An island is 4 km from point S 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?

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter59: Areas Of Rectangles, Parallelograms, And Trapezoids
Section: Chapter Questions
Problem 79A
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The cost of laying a fibre optic cable underwater is 3 times that of underground. An island is 4 km from point S 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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