Can somebody help me? thank you

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

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%