This seems pretty straightforward to me. The key is that the error is consistently 1 higher than the dataset. So the RMSE will just be 1, since the square root of the mean squared error of 1 is 1. I feel pretty confident about this one.
Hmm, this is a tricky one. I think the key is to focus on the "in addition to learning about symmetry" part of the question. The options seem to be about different skills the students might develop, so I'll need to think carefully about which one is the most relevant.
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