ANN ARBOR, Mich. — Domino’s Pizza notched its 31st consecutive quarter of U.S. same-store sales growth, but at a slower pace than investors hoped. Ann Arbor-based Domino’s said sales at established U.S. stores grew 5.6 percent compared with the October-December period in 2017. Wall Street was forecasting growth of 6.8 percent, according to analysts polled