Find the 20th term of an a. p whose first term is 102 and common difference -3

Find dy/dx using implicit differentiation ln(20+e^xy)=y

We just started the introduction into circles and i have no idea how to do this.

The total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?