How Does Changing Mass Density Affect Harmonics in Standing Waves?

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thst1003
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Suppose that you were to apply just enough mass so that four "loops" (harmonics) are visible on a standing wave. If the mass density of the string were to double, how many loops (harmonics) if any would be visible? What about if the mass density were to quadruple? Explain.



This was a lab that I conducted for my Physics class. I know I need to use a formula to figure it out, but which one? Also, this standing wave is in between two fixed points with a consistent frequency being omitted. We just changed the tension of the string by hanging different masses on the one end so that we would get different amounts of harmonics to be shown.
 
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Anyone?? I can't figure it out!