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Mathematics 3 Online
OpenStudy (anonymous):

In oil pipeline construction, the cost of pipe to go underwater is 60% more than the cost of pipe used in dry-land. A pipeline comes to a river that is 1KM wide at point A and must be extended to a refinery, R, on the other side, 8KM down the river. Find the best way to cross the river (Assuming it is straight) so that the total cost of the pipe is kept a minimum. (give you answer correct to one decimal place)

OpenStudy (anonymous):

This is the answer http://ca.answers.yahoo.com/question/index?qid=20100326222123AAOmh5c but i don't understand what the person did i never learned Leibniz notation

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