Refer to the graph to answer each of the following questions. For part (a), use interval notation to report your answer. (a) For which values of x in (0,8) is f concave down? (If the function is not concave down anywhere, then enter none.) Concave down on (b) Find all values of x in (0,8) where f has an inflection point, and list them (separated by commas) in the box below. (If there are no infle points, then enter none.) Inflection Points at x =

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