what is the density of a sphere in kg/ L if the mass is 675.1 mg and the radius is 48.3cm what is the volume (L) of a rectangular prism with a...

1. what is the density of a sphere in kg/ L if the mass is 675.1 mg and the radius is 48.3cm
2. what is the volume (L) of a rectangular prism with a density of 5.43*103 mg/ml and a mass of 3.89*104g.
3. what is the mass (g) of a cylinder with a density of 2.20*10-2 kg/L, radius of 12.70 m and length of 53.94 m.

Thanks for your help