By Caroline Valetkevitch NEW YORK (Reuters) -U.S. stocks finished lower on Tuesday, breaking a three-session string of record closing highs, as Federal Reserve Chair Jerome Powell said the U.S. central bank needs to balance inflation concerns with a weakening job market in its coming interest rate decisions. The Nasdaq led declines, with shares of Nvidia falling 2.8% after rising in the previous session, when the chipmaker said it plans to invest up to $100 billion in OpenAI. Amazon.com, Microsoft and ...