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S(x) = -x 3 - 9x 2 + 165x + 1300, 5 x 20 is an approximation to the number of salmon swimming upstream to

S(x) = -x³- 9x²+ 165x + 1300, 5 x 20 is an approximation to the number of salmon swimming upstream to spawn, where x represents the water temperature in degrees Celsius. Find the temperature that produces the maximum number of salmon.

a. 20 degrees c. 6 degrees

b. 19 degrees d. 5 degrees

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