Let f be the function defined by 9+2 3 (a) determine the y-intercept. (b) determine the horizontal and vertical asymptotes. (c) use the sign pattern for f"(x) to determine (i) the interval(s) over which f rises and where it falls; (ii) the local extrema (d) use the sign pattern for f"(ax) to determine (i) where the graph of f is concave up and where it is concave down; (i) the inflection point(s) (if any).