Work out the area of this circle

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

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!

Mia’s gross pay is 2953 her deductions total 724.15 what percent if her gross pay is take-home pay