Math work pls help :)​

Find the commission on a $590.00 sale if the commission is 15%.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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