Work out the size of angle x​

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

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?

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?