Can someone help me solve this plz

Which expression converts 45 degree to radians

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

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