Apostcard is 4 inches shorter than an envelope. the envelope is 10 inches long. how long is the postcard? the diagram below could be used to solve this problem. write and solve an equation to find the length of the postcard.

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?