A new rectangular holding tank is being built. The tank's sides and bottom should be 2 feet thick. Its outer length should be twice its outer width and height. What should the outer dimensions of the tank be if it is to have a volume of 288 cubic feet? Use x for the outer width of the tank. The equation is= (___ x___ )(x___ 4)(x −___ ). The tank should be___ feet long, ___ feet wide, and ___feet high.