The diameter of a sphere is doubled. what is the new volume of the sphere? a) 8/3πr3 b) 16/3πr3 c) 32/3πr3 d) 64/3πr3

We  know that
[volume of a sphere]=(4/3)*pi*r³
if the diameter is doubled 
then 
the radius also is doubled

the new volume=(4/3)*pi*(2r)³> 8*[(4/3)*pi*r³]> (32/3)*pi*r³

the answer is C)
32/3πr3 

The answer is 1 because you have to flip the sign when dividing by negative number and 3