Tell weather x and y show direct variation

During a wright loss challenge your friend goes from 125 pounds to 100 pounds.what was the percent weight loss

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?

What is the base of the exponential expression of 4 to the power of 5