Using the derivative of f(x) given below, determine the intervals on which f(x) is increasing or decreasing.f'(x) = (1 - x)(9 - x)
A. Decreasing on (-?, 1) ? (9, ?); increasing on (1, 9)
B. Decreasing on (-?, -1) ? (-9, ?); increasing on (-1, -9)
C. Decreasing on (1, 9); increasing on (-?, 1) ? (9, ?)
D. Decreasing on (-?, 1); increasing on (9, ?)
Answer: C
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