Calculus answers

Hi, I have used Khan Academy for years and love the site. I also use Delta Math. I find that when I click the hints on Khan Academy it is so confusing since a lot of it is text based which I don't think works as well as it does for the videos, as if I do not understand the theoretical reason for the answer. I am attempting to complete a calculus problem about related rates and am looking for a variable, however I do not know what the variable is and I find that the wordy hints are not helping me at all. Please change it so that it is a more straightforward mathematical hint. Thanks.