A Minneapolis-based, for-profit, education management company is expanding the private elementary school it opened 10 years ago in Eagan. Education Alternatives Incorporated plans to add an 11-classroom wing to its Tesseract (TESS-er-act) School and expand its program to seventh and eighth grades. The company's success with this suburban private school has been overshadowed by well-documented failures in urban public schools. Despite that troubled history, E-A-I officials say the company has a place in public education. Minnesota Public Radio's Tim Pugmire reports... Education Alternatives Incorporated opened its first private preschool and elemenetary school with 42 students in September 1987. Enrollment a