The girl loves to go shopping.
Inference:

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

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?