Hi plz help ASAP tyyy ^^​

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

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1