Idon't understand it at alll someone give me the answer

Can (2,3 and square root 10) be sides ona right triangle?

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.

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14