When substitute teachers go wrong

Deborah Juarez had a frustrating time with Algebra I.  She says the class was taught by an assortment of substitute teachers, which creates confusion for students as they try to adapt to different teaching styles and learn math without a routine.  Students' education suffers, she writes, when temporary teachers give them busy work and spend the class time babysitting.  The troubles with "subs," on We'Ced.