If the radius of a cylinder is made 3 times and height is doubled, what is the new volume of the cylinder divided by the old one?  Pick.
A) 18. B) 2. C) 6. D) 4. E) 10.
let v and v' be the original and the changed volume   now   v=pir^2h   v'=pi(3r)^2(2h)   v'=18v   18.) 18
<result>A</result>
If the radius of a cylinder is made 3 times and height is doubled, what is the new volume of the cylinder divided by the old one?