Question 1007281
You pay to compensate a live, in-person tutor because the level of interactivity is far greater than just posting a question on a web based internet site.  Scheduling is better.  


You can ask questions for help here for free, but someone might or might not answer; or you might or might not get the help you could best use; or either or both of you have inadequate skills with the drawing, graphing, or symbolic rendering code to make things neat enough to read or be written/drawn.  You in the direct presence of a real tutor can use as simple as pencil on paper, and the communication can be more comfortable and clearer for both of you.