My first encounter with such a problem was in a Mastery Challenge, to simplify a^(1/6). I had no idea how to answer the question because there is no 'n-root' button. I went to the subject page hoping to find an explanation but found none. It was only by accident that I realized it's possible to modify the '3' after inserting a cube-root symbol. In my opinion it would be much more intuitive to have an 'n-root' button in addition to or instead of the cube-root button. Or at least a tool-tip of some sort indicating the '3' can be modified after inserting a cube-root symbol. Thank you for your consideration.
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