Is this relation a function? and would you explain how you got the answer, because i am stumped.
domain. range
2. 6
5. 7
6. 9
6. 10

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