Please answer the following questions

7. [-/7 Points] DETAILS MY NOTES SCALCLS1 4.2.026. | ASK YOUR TEACHER PRACTICE ANOTHER Consider the function below. fx) =6+ 3x x (a) Find the interval of increase. (Enter your answer using interval notation. If an answer does not exist, enter DNE.) Find the interval of decrease. (Enter your answer using interval notation. If an answer does not exist, enter DNE.) (b) Find the local maximum value(s). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) Find the local minimum value(s). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) (c) Find the inflection point. (If an answer does not exist, enter DNE.) o ) Find the interval where the graph is concave upward. (Enter your answer using interval notation. If an answer does not exist, enter DNE.) Find the interval where the graph is concave downward. (Enter your answer using interval notation. If an answer does not exist, enter DNE.) Submit Answer 8. [-/1 Points] DETAILS MY NOTES SCALCLS1 4.2.045.ML. Suppose the derivative of a function fis f'(x) = (x + 1)5()( - 5)3(;( - 7)3. On what interval is f increasing? (Enter your answer in interval notation.) Submit Answer 9. [-/1 Points] DETAILS MY NOTES SCALCLS1 4.2.057.ML. ASKYOUR TEACHER PRACTICE ANOTHER Find a cubic function f(x) = ax> + bx? + cx + d that has a local maximum value of 4 at x = =4 and a local minimum value of 0 at x =2, fx) :' Submit