1/2 times 4 /please answer for me :)

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Which expression is not a polynomial?

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