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V = 972pi cu.yds
V(sph) = (4/3) pi r^(3)
Hence
972pi cu.yds = (4/3) pi r^(3)
Cancel doewn by 'pi'
972 = 4r^(3) / 3
Multiply bo the sidex by '3'
Hence
2916 = 4r^(3)
Divide both sidesx by '4'
729 = r^(3)
Take the cube root of both sides
729^(1/3) = r
r = 9 yds.
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