Can someone explain/answer this? I think I know the answer but I want to be entirely sure

Ineed someone to me answer my question i have to have this done and knocked out

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

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