Question 586965
The formula for the volume of a sphere is V=4/3πr^3. Find the radius of a sphere with each volume.

1. 10 in^3
{{{Vol = 4*pi*r^3/3 = 10}}}
Solve for r
{{{4*pi*r^3 = 30}}}
{{{r^3 = 30/(4*pi) = 7.5/pi}}}
{{{r = root(3,(7.5/pi))}}}
r =~ 1.3365 inches
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You can do that for each one, or do it once and plug in the volumes.
You can make an Excel sheet to do them, too.  Make it once, it works forever.
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{{{Vol = 4*pi*r^3/3}}}
Solve for r
{{{4*pi*r^3 = 3*Vol}}}
{{{r^3 = 3*Vol/(4*pi)}}}
{{{r = root(3,3*Vol/(4*pi))}}} inches
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2. 20 ft^3        
3. 0.45 cm^3      
4. 0.002 mm^3

I tried doing the problems like this: 10/4/3π;  it's not the right way, but I don't know how. It has to be answered as a radical expression. How do I do that?