Question: What technique(s) do I need to use to solve this? I don't understand the concept. Please make notes and explanations so I can understand better
What technique(s) do I need to use to solve this? I don't understand the concept. Please make notes and explanations so I can understand better what I need to do to solve this kind of problem. Thank you!

An offshore oil well is 3 kilometers off the coast. The renery is 5 kilometers down the coast (see gure). Laying pipe in the ocean is twice as expensive as on land. What path should the pipe follow in order to minimize the cost? x= km X
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