Please need help with this

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

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?

Determine the area of a triangle with (see picture below)