The answer key for 6-3 is very wrong. It needs correction. It makes it so my old (2001) text is better to use. If you want teachers to really use this, you need to provide correct and complete teacher support materials. Many teachers don't have time to correct your errors and I was considering CK-12 because the materials all seemed to have answer keys. Having an answer key shortens how much time I spend in preparation for classes because I don't have to do the assignment while preparing for class.
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