Use the given graph of the polynomial function to complete the following a. The x-intercepts are x = a. Estimate the x-intercept(s). (Use a comma to separate answers as needed.) b. State whether the leading coefficient is positive or negative. c. Determine whether the polynomial function is cubic or quartic. b. What is the sign of the leading coefficient? O Positive Negative c. What is the nature of the polynomial whose graph is shown in the figure? O O Quartic