Area of irregular shapes?

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a