Name the angles adjacent to angleXOY

You are studying different function tools and begin working with this function y=-160-9(x) use the equation to answer the question y=-160-9(x) what is the y value when x equals -13? y=-160-9(x)

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

Which of the following contains a variable?