The figure is made up of a cylinder and a half sphere. what is the volume of the composite figure? round to the nearest hundredth. radius: 4mm cylinder length: 7mm

We know that
[volume of the composite figure]=volume of cylinder + volume hemisphere

volume cylinder=pi*r²*h
r=4 mm
h=7 mm
volume cylinder=pi*4²*7> 351.68 mm³

volume of hemisphere=(4/6)*pi*r³
r=4 mm
volume of hemisphere=(4/6)*pi*4³> 133.97 mm³

[volume of the composite figure]=351.68+133.97> 485.65 mm³

What’s the equation you are trying to solve to get x?