I need help asap! math problem

Bring the fraction a/a-4 to a denominator of 16-a^2

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?

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.