Four students are working in a tutorial discussion group. The tutorial leader, Isaac, is helping three students who are having difficulty understanding algebraic equations. He asks each student questions and provides feedback for the responses. He also encourages each student to ask questions. After two days of working in the group, Mark and Jorge have a better understanding of algebraic equations, but Glenn says, "I still don't get it." What can the tutorial leader do to help Glenn understand the concept of algebraic equations