The lesson taught at Roxana Senior High School Wednesday was not typical. A teacher asked students how high they would be three hours after using cocaine and how much they would owe a dealer for a $1,000 payment paid at only 25 percent a day for a year. Teachers and students were shocked. Parent Christy Scott looked at a photo of the assignment which was sent to News 4. "Wow. That's a school math problem?" asked Scott. Student Joseph Saban was not in the class, but he's heard all about it. Saban said he is not offended... "Either he was...