.4 Let f(x) = + ? and let R be the region bounded by the graph of f and the x-axis on the 8 4 . ' interval [1, 4]. . a. Fmd the area of the surface generated when the graph of f on [1, 4] is revolved about the x-axis. Use technology to evaluate or approximate the integral. b. Find the length of the curve y = f(x) on [1, 4]. c. Find the volume of the solid generated when R is revolved about the y-axis. _ _ d. Find the volume of thesolid generated when R is revolved about the x-axis. Use technology to evaluate or approximate the Integral. a. The area of the surface generated is I]. (Do not round until the nal answer. Then round to the nearest tenth as needed.) I}