There are several chickens and rabbits in a cage (with no other types of animals). there are 72 heads and 200 feet inside the cage. how many chickens and rabbits are in the cage?

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?