Instruct: Classify the given review as either positive or negative.
Query: Correct answers would be nice.

The majority of this book is very useful, but I find it inexcusable to have at least two incorrect math problems, one in the graphing section and one in the quantifier section. 28 students took geometry in the winter, not the spring. How can you have no green marbles, yet have a collection of marbles, some colored only green? Also, some students might find it helpful if you explained the pi symbol just a bit before throwing it in. And the fact that you give a number for feedback that can't be reached from California, for a test in California is quite lame.