Help me solve this problem please

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

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?

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers?