Solves this system of equations by using the elimination method

1. what are the missing reasons in the proof 2. it's in the second picture and 3

What is the absolute value of the complex number -4-sqrt2i

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.