An offshore oil well (A) is 28 kilometers off the coast (C) and a renery [B] is 35 kilometers down the coast (see gure). Laying pipe in the ocean is twice as expensive as laying it on land. If the cost of laying pipe on land is 98 dollars per kilometer, how far down the coast should the pipe reach land in order to minimize the total cost of laying pipe? Use the extreme value theorem to answer this question. Round your answer to four decimals