May 21 (Reuters) - Wall Street’s main indexes opened higher on Friday, extending a recovery from the previous session, as attention shifted to business surveys at the end of a volatile week of trading. The Dow Jones Industrial Average rose 37.8 points, or 0.11%, at the open to 34121.91. The S&P 500 rose 9.5 points, or 0.23%, at the open to 4168.61, while the Nasdaq Composite rose 80.4 points, or 0.59%, to 13616.186 at the opening bell. (Reporting by Shashank Nayar in Bengaluru; Editing by Maju Samuel) Our Standards: The Thomson Reuters Trust Principles.