Solve the problem. Round to tenths where necessary.S(x) = -x3 + 6x2 + 288x + 4000, 4 ? 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. 12°C
B. 8°C
C. 20°C
D. 4°C
Answer: A
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