What are the greatest common factors of 15, 25, and 39

Aiden buys two bags of chips at $1.09 each and a 20 ounce soda for $1.20 at the gas station.he knows that the state tax is 5.5. how much change will he receive from a $5 bill?

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)