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**Mathaticaln00b** I have a simple yet frustrating problem.

V=15

h= 2.54

r= ?

V= pi*h(3r^2 + h^2) / 6

what is the value of r?

Now I need a complete break down of the reasons for the working of this equation.

I have asked sevral sites and the explanations are difficult to understand.

I need it in plain english.

Someone said I had to divide V/(3*pi*h) to find r

now what i want to know is what formula he used to come to that decision telling me the answer like that is no good.

what i need is to know why make descisionlike this so i can solve ALL algrebra question.

please help

I am looking for somone who will also perhaps be will to PM so i can understand

thank you