The variable selection procedure that identifies the best regression model, given a specified number of independent variables, is a. stepwise regression. b. best-subsets regression. c. backward elimination. d. forward selection.

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm