If the radius of a cylinder is doubled and height 4 times, what is the new volume of the cylinder divided by the old one?
Choose the correct choice:
A) 8.  B) 2.  C) 6.  D) 4.  E) 16.
let v and v' be the original and the changed volume   now   v=pir^2h   v'=pi(2r)^2(4h)   v'=16v   16.) 16
<result>E</result>
If the radius of a cylinder is doubled and height 4 times, what is the new volume of the cylinder divided by the old one?