- Can someone help me on this linear algebra question!?!? I am so confused!!?

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What should be added to equation to make it a perfect square 9x^4 + 2x^2 + 25? ....Please!? W^44 + w^45 = ? Options : A)-1 B)-1/w C) 1/(-w^2) or none.
I know that w^3 = 1 the answer is c...how? The empirical formula of hydrazine is NH2, and its molecular mass is 32.0 grams. What is its molecular formula? Two review questions and an explanation would really help too on how you got the answer? What is the nuclear decay equation for Carbon-14? #Chemistry?