How do I answer these questions that correspond to the graph below?

30. (In part c below, you choose "Positive", "Negative" or "None".) Below is the graph of a polynomial function f with real coefficients. Use the graph to answer the following questions about f. All local extrema of f are shown in the graph. (a) The function f is decreasing over which intervals? Choose all that apply. O (-00 , -9) 0 (-9, -5) 0 (-5, -1) (-9, -1) (-1, 5) (9, 00 ) (b) The function f has local maxima at which x-values? If there is more than one value, separate them with commas. 0 (c) What is the sign of the leading coefficient of f? Select One (d) Which of the following is a possibility for the degree of f? Choose all that apply. 4 0 5 0 6 07 0 8 0 9