How Many Hours Do U.S. Undergrads Work Each Week?

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If you are currently an undergrad in the U.S. how many hours a week do you work or are you unemployed? This is for my statistics class. Thanks!
 
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40 hours a week

I have a lot of time to study at work though so it's really not that bad.
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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