Review: I'm using it right now in 10th grade (my school does Algebra 2 in 9th grade) and I love this book because it is easy to understand, gives definitions in a simple manner and plenty of examples with answers. The problem sets are at most 30 problems (which is great for homework in comparison to the 40-100 problems I got last year) and some of the odd answers are available in the back to check your work! The chapters are well divided and give you enough info for you to digest it all and enjoy geometry. I'm sure the challenge will come in later chapters :)