Cassie Bush, left, and Jason Phillips, right, collaborate on a problem during a math class at Athens Drive High School in Raleigh on Sept. 4, 2014.
Cassie Bush, left, and Jason Phillips, right, collaborate on a problem during a math class at Athens Drive High School in Raleigh on Sept. 4, 2014. Chris Seward News & Observer File Photo
Cassie Bush, left, and Jason Phillips, right, collaborate on a problem during a math class at Athens Drive High School in Raleigh on Sept. 4, 2014. Chris Seward News & Observer File Photo