Can you help me I been trying to do this for 2 days now and i cant do it

How do you find principle and simple interest

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

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.