A cylinder is shown. A half-sphere is stacked on the top and the bottom of the cylinder. The diameter of the cylinder if 20 and the height of the cylinder is 28.
Which expression represents the volume, in cubic units, of the composite figure?
(Four-thirds)π(103) + π(102)(28)
(Four-thirds)π(203) + π(202)(28)
2(Four-thirds)π(103) + π(102)(28)
2(Four-thirds)π(203) + π(202)(28)