



 
Hello Ashley. The dimensions of a cylinder are the height, h, and the radius r. So the cost of the cylinder is
The volume of a cylinder is V = π r^{2} h, so if V=100, then
If we substitute this expression for h into the cost equation, then:
Now you have a single equation with two variables. Can you do the final step and find the value of r that gives the smallest C(r)? Hope this helps,  


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