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For this question, when finding bond lengths you would look at the average of the two since resonance is the blending of structures. Thus, you would take the average of 140pm and 120pm to get 130pm as the bond length.
Since resonance is the blending of structures, each N-O bond is an average of the double and single bond shown on the lewis structure. Therefore you would take the average of the two bonds. (140pm+120pm)/2 = 130pm
If you didn't get your midterm after lecture last week, go to your TA and they should have it. When your TA graded it they did a pretty good job of explaining what you got wrong and can explain why you got things wrong.
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