A13. The graph of y = arctan x has (A) vertical asymptotes at x = 0 and x = (B) horizontal asymptotes at Y= N (C) horizontal asymptotes at y = 0 and y = n (D) vertical asymptotes at * = + 7t 2 A14. The graph of y = x - 9 has 3x - 9 (A) a vertical asymptote at x = 3 (B) a horizontal asymptote at y = (C) a removable discontinuity at x = 3 (D) an infinite discontinuity at x = 3