Please help this is a major grade

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Can someone me out here and the tell me the greatest common factor

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.