How fast was a plane flying if it traveled 40 kilometers in 30 minutes

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

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

Write the fraction or mixed number and the decimal shown by the model