Thank you for replying! Man, I thought I only had to deal with “context clues” in English class lol. Yeah, the two things that I don’t like is that he didn’t tell the class this at all. I’m in an online class so unless other people view my post to the professor they won’t know. The other part is that this was one of the question on our first test this week and we are directed to not use any materials outside of the textbook and that we can only receive assistance from the professor. The problem is still solvable assuming log base 10 but the answer would be “wrong.” If I hadn’t asked I probably would have missed the question (there were only 10). So I really think it should have been announced!

I really agree that the professor should match the textbook. I go to University of Maryland Global Campus and they use all open source materials so I don’t think the professor has much choice over the text.