Which rule defines the function in the graph?

State if the two triangles are congruent. if they are, state how you know?

Math it's appreciated. (picture provided)

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?