marcus has $15.00 to spend on fruit. he buys 3 mangoes and spends the rest of the money on grapes. the store charges $0.75 for each mango and $2.50 per pound for grapes. which equation respresents the number of pounds of grapes marcus bought and how many pounds of grapes did he buy?

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?