Your concept map will bring together what you learned about in this unit. The concept map should be accompanied by a written summary of at least 250 words that verbally describes the relationships in your concept map. You will submit this concept map and the written summary as a portfolio item at the end of this lesson. All of the following key terms should be included in your concept map and written summary. You can include other key terms, but that is not required. average rate of change average speed composite of continuous functions continuity at a point continuous at an endpoint continuous function continuous on an interval difference quotient Difference Rule for Limits discontinuous end behavior model horizontal asymptote instantaneous rate of change