What’s the answer to this?

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

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?

Which of the following is missing in the explicit formula for the compound interest geometric sequence below?