Pls help me I don't get it at all?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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 approximate value of  x  in the equation below.–3.396–0.7080.3040.955