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In a Wednesday, Jan. 15, 2014 photo, math teacher Tracy Popescu, right, helps high school junior Carter Buono, 17, with a problem Algebra II books sit lined up in a high school math class at Flower Mound High School in Flower Mound, Texas, Wednesday, Jan. 15, In a Wednesday, Jan. 15, 2014 photo, a high school student adjusts a tablet device in an algebra II class at Flower Mound High Sch