2 answers:
Yes because removing the common factor is important. There are a few steps, then you can factor by regrouping. Hope this helps.
Yes. As you can see, 15 and 10 are both factors of 5. So, if you take out a 5, you're left with 5(3x-2).
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Answer: option a. accurate.
That the data fit closely a model means that the model permits both to reproduce actual data and to predict values with a good accuracy.