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Can some one me with these questions

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

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?