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how to change If f (x) = 27x(x -5), then Select one: O a. f concave up on (0, 5) O b. f concave down

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If f" (x) = 27x(x -5), then Select one: O a. f concave up on (0, 5) O b. f concave down on (0, 5) O c. f concave down on (-27, 0) O d. None of these

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