The purpose of this paper was to explore (1) the facilitative effect of the use of a graphing calculator (gc) on mathematical problem solving in the context of an adult (18+) college algebra class; (2) the connection between mathematics self-efficacy (mse) and college students' academic performance by using the gc as a tool in the college algebra class, (3) the effects of 6-week interventions designed to increase mse; and (4) the relationship between mse and individuals' learning styles. The results show that gc practice does benefit problem solving, particularly when the problem requires...