Jake is placing a mat of width w+4 around a 40 cm by 50 cm portrait. write an expression for the perimeter of the outer edge of the mat

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters