. Let a, b € Z so that 4a + 5b is a multiple of 13. Prove that 13 divides 9a + 8b.

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Q: Exercise 5.5.8 Explain why an nxn matrix A is both one to one and onto if and only if its rank is n.

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Q: Theorem 1.5. The principal normals at consecutive points of a curve do not intersect unless t = 0)

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Q: Find the volume between y=-x² + 2x with the Pappus method and y = -√√3x around y=x+2.

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