Sampling, mark and recapture, indirect observation, and direct observation
1. 50 degrees
2. 130 degrees
3. I think B to A is 100
It helped because it enabled other fronts to open up because the American Offensive in the area ended with a victory, which meant that they could move to other areas and bother Germans there. They didn't' do this however because the fighting ended since the Germans became aware of their losses and signed an armistice.
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https://www.sutori.com/story/enlightenment-and-the-french-revolution
