Which of the following best describes theorems

This is about circle theorems. someone asap : (

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.