Determine if the relation is a function or your answer.

plz !

1) { (3,6), (3,5), (6,5), (7,5) }

2) { (6,7), (8,9), (2,7), (5,10) }

3) { (3,6), (5,9), (4,10), (2,8), (3,9) }

4) { (1,5), (1,8), (1,13), (1,6) }

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?

This is about circle theorems. someone asap : (

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.