Represent the following expressions as a power of the number a(a$\ne $ 0) : (a^2*a^-5)^-3*(a*a^3)^4

Which equation matches the graph shown ?

Is there an x intercept in the equation 60*1.15^x

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?