The initial number of trees is when t = 0:- 1500 * t^0 = 1500 so the answer is either a or c. The value 1.02 represents a 2% increase so the answer is Option c.
You can let the sides be a and b. You can then use the Law of Sines to create an equation relating the two sides and the angles opposite them, and finally isolate a/b.