Ideposited $4,000 into an account that earns 5% interest each year. the growth of my investment can be expressed by the exponential equation a= 4000 (1 + 0.5) where is the amount in the account after t years. in how many years will my account exceed $10,000?

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?