7a - b- 6a + 5b find the answer to the equation

Change negative exponents to positive. then solve. round to four decimal places

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?

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?