It total revenue is $3000, cost of goods is $1500, and total selling expenses is $500 what is the profit for the business

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

What is the perimeter of an equilateral triangle if each side is (x+3)?

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?