3. [1/2 Points] DETAILS PREVIOUS ANSWERS LARCALC11 3.4.005. 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.) R(x) = x - 4x + 9 concave upward (-00,2) concave downward DNE Need Help? Read It Watch it 4. [0/2 Points] DETAILS PREVIOUS ANSWERS LARCALC11 3.4.006. 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.) g(x) = 12x2 - x concave upward DNE concave downward DNE Need Help? Read It Watch it 5. [-/2 Points DETAILS LARCALC11 3.4.007. 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.) R(x) = x4 - 9x concave upward concave downward Need Help? Read It Watch It 6. [-/2 Points] DETAILS LARCALC11 3.4.009. 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.) {{x) = - 19 x2 + 12 concave upward concave downward Need Help? Read It Watch it