2- ["2 hints] DETAILS \"RCAL'E" \"-005- MY NOTES ASK YOUR TEACHER PRACTICE ANOT 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) = x4 - 7x3 concave upward concave down ward Need Help? 3- ["2 mm] DETAILS \"RCALCE\" \"-010- MY NOTES ASK YOUR TEACHER PRACTICE ANOT Determine the open Intervals on which the glaph is concave upward or concave downward. (Enter your answers using interval notation. If an answer doe: not exist, enter DNE.) x+3 x? x) - concave upward concave downward 4. [-/3 Points] DETAILS LARCALCET7 4.4.015. MY NOTES ASK YOUR TEACH Find the point of inflection of the graph of the function. (If an answer does not exist, enter DNE.) f(x) = x3 - 3x2+ 22x - 20 ( x, V ) = Describe the concavity. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) concave upward concave downward Need Help? Read It Watch It 5. [-/4 Points] DETAILS LARCALCET7 4.4.028. MY NOTES ASK YOUR TEACH Find the points of inflection of the graph of the function. (If an answer does not exist, enter DNE.) f(x) = 4 sin x + 4 cos x, [0, 2x] ( x, y ) = (smaller x-value) ( x, y ) = (larger x-value) Describe the concavity. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) concave upward concave downwardFind the point of inflection of the graph of the function. (If an answer does not exist, enter DNE.) f(x) = x + 6 cos x, [0, 2x] (x, y ) = (smaller x-value) ( x, y) = (larger x-value) Describe the concavity. (Enter your answers using interval notation. If an answer does not exist, enter DNE.) concave upward concave downward