Use the trigonometric subtraction formula for sine to verify this identity (pi/2-x)=cos x

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?

Spencer has 1/3 pound of nuts he divides them equally into 4 bags what fraction of a pound of nuts is in each bag

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.