If sinA=1/2 what is cosA

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

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?

If the tip varies directly with the number of guest which equation represents between the tip, t, and the number of guest, g?