which statements are always true for the graph of a cubic function?  I) When the graph has exactly 1 x-intercpet , the graph has no hills no valleys  II) when the graph has 2 or 3 x-interpects, the graph has 1 hill and 1 valley  III) when the x3- term is possitive , the graph falls to the left and rises to the right IV) when the x3- term is negative , the graph rises to the left and falls to the right

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