Musical teachers

The gentleman I am in for during the beginning of this week is a math teacher.  He teaches Algebra I, Geometry, and Pre-Calculus.  Needless to say, I am absolutely useless as an instructor, and not much better as someone who can answer questions.  I can, however, sit in a classroom and keep things legal.  While this is relatively true nearly everywhere I sub at the high school, it is much more the case in a math room (and science would be a close second).  However, these students can't lose days upon days of math instruction.  The Algebra students have been reviewing and testing, so I can handle that.  During Geometry, I cover academic study hall (staffed by teachers for additional academic assistance) while that gentleman teaches the class.  During Pre-Calculus, the other teacher who is teaching the class this year comes in and instructs, but he has a class that also needs instruction.  Another teacher covers his class, and I go and cover that teacher's class because he has a student teacher.  It also happens that Catherine is in that classroom and I get to see her.  I love how this department works so well together and everyone pitches in to do what needs to be done for the good of the students.  I am happy to be here and do what I can, but I sure do feel useless!