You need to find the dimension of height of cone such that:

`h = 15 + sqrt(15^2 - r^2)` (r expresses the radius of cone)

You need to remember the formula that expresses the volume of cone such that:

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

You need to substitute 15 + sqrt(15^2 - r^2) for h in formula of volume such that:

`V = (pi*r^2*(15 + sqrt(15^2 - r^2)))/3`

`V(r) = 5pi*r^2 + pi*r^2*sqrt(15^2 - r^2)/3`

The problem provides the information that the cone has maximum volume, hence you need to differentiate the volume with respect to r, such that:

`V'(r)...

(The entire section contains 271 words.)

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