Stock Futures Up on M&A News 
LONDON (AP) - U.S. stock market futures on Monday advanced on a flurry of merger-and-acquisitions activity, including reports of the largest-ever leveraged buyout. Dow Jones futures were recently up 44 points, S&P 500 futures rose 5.7 points, and Nasdaq futures improved 7.5 points. On Friday, a profit warning from Dell Inc. and concerns over a slowing U.S. economy brought the Nasdaq down 19