The art class is constructing a sculpture to place as a memorial at the entrance of the school composed of a sphere and a cube shaped base. The diameter of the sphere must be equal in length to the edge of the cube. The formula below represents the length of the edge of the cube in terms of the total volume of the sculpture. If the art class determined that the length of the edge of the cube is to be 3.5 feet, what volume of sand to the tenth of a cubic foot will be needed to fill the sculpture?