nutius

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15 years, 72 days

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These are answers submitted by nutius

Ok, thank you alec!

Thank you very much,alec for your solution! I want also to ask when I calculate a volume of vol2 I get a warning : 

Warning,unable to determine if 64^(1/2)*(z/c)^(1/2) is between -8*(z/c)^(1/2) and 8*(z/c)^(1/2); try to use assumptions or set _EnvAllSolutions to true
Warning,unable to determine if -64^(1/2)*(z/c)^(1/2) is between -8*(z/c)^(1/2) and 8*(z/c)^(1/2); try to use assumptions or set _EnvAllSolutions to true
Warning,unable to determine if -(8/7)*(-c*(-49*z+100*c))^(1/2)/c is between -8*(z/c)^(1/2) and 8*(z/c)^(1/2); try to use assumptions or set _EnvAllSolutions to true
Warning,unable to determine if (8/7)*(-c*(-49*z+100*c))^(1/2)/c is between -8*(z/c)^(1/2) and 8*(z/c)^(1/2); try to use assumptions or set _EnvAllSolutions to true

Could you please help me for the last step?

Thanks

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