Is the set of numbers that can be written as the product of 6 and an integer closed under subtraction? a. yes, because the difference of any two multiples of 6 is equal to 6. b. yes, because the difference of any two multiples of 6 is also a multiple of 6. c. no, and a counterexample is 6 – 6 = 0. d. no, and a counterexample is 6 – 18 = –12.

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.