24% of the books on david's shelf are mysteries. there are 36 mysteries on the shelf. choose the expressions that complete each step involved in setting up and solving the proportion that represents the situation.

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?