How do i solve31.6-1.9

M.xyz =radians. covert this radian measure to its equivalent measure in degrees.

Having a hard time understanding this question (see attachment).

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