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Is it true China recently blew up the moon and replaced it with a hologram? What is the contrapositive for the following statement? A∩Bc=∅ if A⊆B. Bc = B complement? Find the derivative with respect to x of 3x³ + 2 from its first principle? How many electrons does sodium have in its outer shell? I need help w/ a complicated Pythagorean Theorem prob.This box won't allow me to put the whole question but I can comment it. Help please!?