Carl Witter’s Algebra I class is discussing a multiple choice problem involving percents. Standing at the overhead, Witter asks students to raise their hands to vote for the answer they think is correct. As they vote, students talk among themselves. Lakisha asks a friend, “Why are you raising your hand for that one?” Her friend explains, “It’s gotta be C.” Another student responds, “No way!” Across the room, Sonia calls out, “All I know is that it’s not A.” Shortly after, Lakisha looks at Witter and asks, “Are you trying to trick us?” The teacher smiles and laughs as he continues to count the raised hands. After Witter completes his tallies, he turns to the class. “Sonia had an interesting comment. Sonia, why are you