Question 430937
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Hi
Volume(Sphere) = 4/3pir^3  and r = {{{root(3, (3/4)*V/pi)}}}
 4/3pi2^3  +  4/3pi3^3 +  4/3pi4^3  = 4/3*99pi = {{{132*pi mm^3}}}

 r = {{{root(3, (3/4)*132pi/pi)}}}
 r = {{{root(3,99)}}} = 4.63 mm (to nearest hundredth of a mm)