How many sides does a decagon have?

A penniless Russian student sews a loop in his coat to hold an axe early in which 1866 novel? A deadlocked jury is called what 4-letter word? A deadly disease was identified after an outbreak at which group's 1976 convention in Philadelphia? A deaf and blind girl gets help from a special teacher in which 1959 play? The State Hermitage Museum, one of the world's largest art museums, is in which city? Pressure from which ruler led to the dissolution of the thousand-year-old Holy Roman Empire in 1806? Which word means both a deep guttural sound and slang for a U.S. infantryman? Which word means both a deep shade of black and a plane like the 747?