Problems (7) to (9): Sketch the curve by following the steps. (a) Determine the domain, and locate any r- and y-intercepts. (b) Find the interval(s) on which f(x) is increasing or decreasing, and the coordinates of any local extrema. (c) Find the interval(s) on which f(x) is concave up or down, and the coordinates of any inflection points. d) Determine the equations of any vertical or horizontal asymptotes. (e) Sketch the graph of the function. Label the ares, scale, and any important coordinates. As practice for the exam, make sure to do this by hand, without a graphing calculator. (7) y = 12x - 23 x (8) y = 2 - 3x2 - 9x (9 y =