The sum of 9 and twice a number

i need to write this as an algebraic equation.

the unknown number is n

Me because some of question i don’t understand

What is the measure of angle x? answer

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?