What a story problem to represent 6÷1/5 and u have to actually write a problem problem

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

Aresearcher believes increased perceived control influence the well-being of residents at a nursing home. to test this , she allowed one group of residents to have control over their daily lies, (where to eat etc) . the other group of 5 residents had these deceisions made by staff. the resident's feelings of well-being were measured on a 10 point scale at the end of a one month trial period. is there a difference on well-being?

The number 72 lies between what perfect squares