For which system of equations is the graph below a solution?​

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

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

Aweekly newspaper charges $72 for each inch in length and one column width. what is the cost of an ad that runs 2 column inches long and 2 columns wide? its not 288