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I need help on understanding what the question is asking.
A fish swims at a speed v relative to the water, against a current of 9 mi/h. Using a mathematical model of energy expenditure, it can be shown that the total energy E required to swim a distance of 18 mi is given by
E(v) = 2.73v^3(18/v − 9)
.
Biologists believe that migrating fish try to minimize the total energy required to swim a fixed distance.
Find the value of v that minimizes energy required.

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