Problem #18: Find the volume of the solid obtained by rotating the region bounded by the curves y = x- + 2, x = 0, and [2 marks] y = 18 about the y-axis. (A) 1247 (B) 1217 (C) 1267 (D) 1227 (E) 1271 (F) 1237 (G) 1257 (H) 1287 Problem # 18: Select V Save Problem #19: A tank has the shape of a cylinder with height 9 m and base radius 4 m. It is filled with water to a height of 6 m. [2 marks] Find the work required to empty the tank by pumping all of the water to the top of the tank. (The density of water is 1000 kg/m , and use g = 9.8 m/s2.) h (A) 56465537 J (B) 56500597 J (C) 56570717 J (D) 56518127 J (E) 56553187 J (F) 5653565n J (G) 56483067 J (H) 5644800m J Problem # 19: Select V Save Problem #20: Let f(x) = 4axel. Find the value of a if the average value of f(x) on the interval [0, 2] is equal to 9. [2 marks] (A) : In(10) (B) In9 (C) In5 (D) ; In(10) (E) In(10) (F) In9 (G) In9 (H) ; In5 Problem #20: Select v Save