Joseph Hull Division of Science and Mathematics SAM110 Seattle Central Community College 1701 Broadway Seattle WA 98122 USA Greg Langkamp Division of Science and Mathematics SAM110 Seattle Central Community College 1701 Broadway Seattle WA 98122 USA email: greg.langkamp@seattlecolleges.edu phone: 206-934-3810 website: http://seattlecentral.edu/faculty/glangkamp