First to say SOMETHING gets brainliest

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

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?