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Question 6

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Solve the problem.

With x representing the water temperature in degrees Celsius, S(x) = -x3-9x2 + 165x + 1300, 5 sx ≤20 is an

approximation to the number of salmon swimming upstream to spawn. Find the temperature that produces the

maximum number of salmon.

O 20°C

19°C

6°C

5°C

Fig: 1