What happens to the volume of a sphere when the radius is multiplied by 4?

Vsphere = (4/3) pir^3

Voriginal = (4/3) pir^3

when radius is multiplied by 4

replace r with 4r

Vnew = (4/3) pi (4r) ^3

Vnew = (4/3) pi (64r^3)

Vnew = (64) (4/3) pir^3

Vnew = (64) (Voriginal)

the volume is 64 times the original