Factor the expression x4 − y4 using the polynomial identity (x2 − y2) = (x − y)(x + y). Hint: x4 = (x2)2 and y4 = (y2)2.

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.