3) How many arrangements are there of the letters in the word Neutrogena?

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Q: Find a vector equation for the curve of intersection between the surfaces y^2-x^2=9 and 2x-3y-z=12.

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Q: 7. Use CRAMER'S RULE to solve the system: 2x-y-z=2 4x+y-z=-5 6x-2y +2z=17

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