What is the exact value of cos 105°? A.√6 -√2/4 B. √6 +√2/4 C. √2 -√6/4 D. -√2 + √6/4

Need on this geometry question. explain how you did it.

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Need ! 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?