What number represents the same amount as 8hundreds +10 tens +0 ones?

What properties allow transformation to be used as a problem solving tool

Which one ? is the answer and how to find this answer

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