A cell phone plan costs $30 per month for unlimited calling and $0.05 per text message. Write a linear model that represents the monthly cost of this plan if the user sends t text messages. If you send 500 text messages, how much would you pay?

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?