Question 255305
The volume V of a sphere of radius r is V= 4/3, pie R squared. 
If the radius of one sphere is 4 time the radius of the other and the smaller sphere has volume 500 cubic feet, wht is the volume in cubic feet, of the larger sphere?
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It's (4/3)pi*r^3, r cubed.
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Volume is a function of the cube of the radius.
4 x radius --> 4^3 times the volume, = 64 times.
The larger sphere's volume is 500*64 cf
V = 32000 cubic feet
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PS It's the Greek letter pi, not the dessert, pie.