PLZ HELPPP

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

What is the result of the following division?

Ms.ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms.ortiz charge per kilogram of tomatoes to make on a load of tomatoes?