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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