How to do cube root on a normal calculator?

So, I'm doing Geometry homework, and it involves having to do cube root. In class, the graphing calculators will do it, but I can't for the life of me find a calculator online that will give me cube root, and the one on my iphone doesn't do it either. How do I get the cube root?

If you have ' Windows ' under windows accessories you should have a calculator.
If it has x³ then "inv" x³ will give you the cube root.
Most calculators that have xⁿ you select 'inv' xⁿ gives you the nth root

Try this http://web2.0calc.com/

If you are using a Windows PC (preferably Windows 7), go to the Search field at the lower left hand corner of your monitor, type in 'calculator' and press "Enter". Your calculator pops up. Then,
Click on "View"
Click on "Scientific" to change it to scientific mode
The cube root symbol is between x^3 and 1.
To find the cube root of a number say 27, click "27" first, then click on that symbol. The answer is 3.

Wolframalpha.com

http://www.wolframalpha.com/input/?i=%283%29%5E%281%2F3%29

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