Yet another math problem xc halp plz

How do you summarize data in a two-way frequency table?

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

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