Question 1074738
Total Surface area
Includes a length between the two circle parts, h.
{{{2*pi*r^2+h*2pi*r=600pi}}}

{{{2pi(r^2+h*r)=600pi}}}
{{{r^2+hr=300}}}
{{{hr=300-r^2}}}
{{{h=(300-r^2)/r}}}




VOLUME

{{{h*pi*r^2}}}

{{{((300-r^2)/r)pi*r^2}}}

{{{(300/r-r)(pi*r^2)}}}

{{{300pi*r-pi*r^3}}}-------DONE



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Maybe you can do the rest - finding maximum volume