Answer:
V = 12,348·π
Step-by-step explanation:
The given parameters of the glass Vase are;
The shape of the glass vase = A sphere
The radius of the vase, r = 21 inches
The given formula for finding the volume of a sphere is 
Therefore, when r = 21 inches, we get;

Therefore, the expression for finding the equation of the spherical glass vase, V = 12,348·π