a hot water tank was full of hot water before eddy used 15 gallons to wash clothes. now there is only 80% of the hot water left. how much water, in gallons, does the hot water tank hold?

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?