The volume of a cylinder is given by

Let
and 
The new volume becomes

So, the new volume is 8 times the original volume. In fact, volume scales linearly with the height and quadratically with the radius.
I think you are supposed to find the perimeter of it so you add all sides together to get your answer
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Answer:
30mph
Step-by-step explanation:
be smart
I could answer this if you could tell me the value of one of the letters