Un salón de clase tiene a m^2 de área. En el salón hay 25 mesas, de las cuales cada uno ocupa un área de p m^2, y 27 estanterías, de las cuales cada una ocupa un área de 4p m^2. Escribe una expresión algebraica que representa el área del salón de clase que queda libre.

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?