SAN FRANCISCO -- Elon Musk is a man with quite a few balls in the air. On Tuesday afternoon, he watched the private rocket company that he runs, SpaceX, successfully launch its first Falcon Heavy. On Wednesday afternoon, Wall Street will watch as the public automaker that he runs, Tesla Inc., reports fourth quarter earnings.
Information-starved investors will be on high alert, as will thousands of would-be drivers waiting for Tesla to produce and deliver new electric cars. Here are five key questions to ask as a way to gauge Tesla's prospects going into a decisive year.