Which number produces a rational number when added to 0.42

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Which number line correctly shows 0.8 + 0.3?

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?