This document summarizes an activity called "Crossing the River" that was meant to teach algebraic patterns. The activity involved figuring out how to transport a given number of adults and children across a river using a small canoe that could hold 1 adult, 1-2 children, or 1 adult and 1 child. The summary explains that it takes 33 crossings to transport 8 adults and 2 children, and 29 crossings for 7 adults and 2 children. An algebraic pattern of 4n+1 was determined, where n is the number of adults.