Molly wishes to make a lawn ornament in the form of a solid sphere. the clay being used to make the sphere weight 0.075 pound per cubic inch. if the sphere radius is 4 inches, what is the weight of the sphere, to the nearest pound? a)20 b)15 c)4 d)34

The first thing to do in this case is to find the volume of the sphere.
 We have then:
 V = (4/3) * (pi) * (r ^ 3)
 V = (4/3) * (pi) * ((4) ^ 3)
 v = 268 in ^ 3
 Then, the but of the sphere will be given by:
 W = (0.075) * (268)
 W = 20
  
 the weight of the sphere, to the nearest pound is: 
 A) 20