Yall literally I want a new friend whos down

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

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.

Tom drove 206 miles in 3.9 hours. estimate his average speed.