Identify the open intervals on which the graph of the function is concave upward or concave downward. Assume that the graph extends past what is shown. 10 -8-6 -4-20 concave upward: TE concave downward: ON Note: Use the letter Ufor union. To enter oo, type infinity. + ek co 2 4 Enter your answers to the nearest integer. If the function is never concave upward or concave downward, enter NA in the associated response area. x 6 8 10

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