Can someone help me on this math question?

Which best explains why this triangle is or is not a right triangle?

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

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?