Question 91667
:
A tube 10 inches in height has a volume of 5120³.I you halve the height, how large must you make the radius of the tube in inches so that it contains the same volume? Use the formula V = Pi r²h. 
:

{{{pi*r^2*5}}} = 5120
:
{{{r^2 = 5120/(5pi)}}}; divide both sides by {{{5pi}}}
:
r = {{{sqrt(5120/(5pi))}}}
:
r = 18.054 in radius required to have the same volume