What is referred to by '2 cubed equals this'?

Based on the clue '2 contestants try to duplicate the answers given b...', what is the answer? What is associated with: 2 countries joined together in 1990 to form this neighbor of oman? Based on the clue '2 countries share this name the capital of one is ...', what is the answer? Based on the clue '2 crops indigo this grain made the colony wealthy...', what is the answer? Based on the clue '2 culver city fire captains stood by nervously as ...', what is the answer? Based on the clue '2 curved swords a dagger a circle make up the sym...', what is the answer? Based on the clue '2 days after he abdicated the throne edward viii w...', what is the answer? Based on the clue '2 days after james buchanans inauguration the supr...', what is the answer?