When the process of adding or multiplying doesn't change the original number, this refers to which property?

Suppose a least-squares regression line is given by modifyingabove y with caret equals 4.302 x minus 3.293. what is the mean value of the response variable if xequals20?

Which graph represents the linear function below? y-4= (4/3)(x-2)

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?