Find The Area Of This Triangle

1foot = 12 inches; 1 yard = 3 feet

Someone answer asap for ! 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?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.