<p>The Econ 21 prof used calc he wasn’t familiar with and said 30% will drop her class. She said she was using math 11 - and my s didn’t follow her logic. He assumed - maybe most dropped her class because a strong calc background was necessary. her Since calc 3 is a required class for most econ classes - I thought maybe he needed a stronger foundation in this class- before moving onto calc 8. He also taught most of calc to himself thru independent study in high school- so this also influenced my advice to him. The same is true w/ stats - self taught/ independent study. Thx for the advice re: Econ 10.</p>