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How many grams of nitrogen molecules (N2) are present in 3•10 22 number of N2 molecules? How can a person prove that all his ancestors were European? A ciecle x^2 + (y - a)^2 = 1 is competely in the region D = {(x, y): y >= x^2}. a is a real value.
What is the min value of a? In layman's terms, explain how an invisible cocoon suppresses electromagnetic reflection? Numbers to the left of 0 on the number line are positive?