he diagonals of quadrilateral QRST intersect at P(-1,3). QRST has vertices at Q(1,7) and R(-4,5). What must be the coordinates of S and T to ensure that QRST is a parallelogram

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.