Can someone me with this question?

Factor the expression using the gcf. the expression 21m−49n factored using the gcf

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account

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?