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Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does

Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) 18 x + 12 X f(x) = concave upward concave downward Need Help? Submit Answer Watch It

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