Please help me with problems 41 - 44 and 49 - 52

For how answer my question this will be the last question can you answer in math subject

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

Find the missing factor. write your answer inexponential form.9^2=9^4×