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The matrix C=[1,-2_-3,7] was used to encode a phrase to [7,-28,-25,-35,-2_-21,107,90,123,17]. Find C^-1 and use it to decode the matrix.

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A segment with the endpoint X(-6,2) and Y(-1,-3) is rotated 90 degrees about the origin. What are the coordinates of X’ and Y’? 1- X’ (-1,-3) Y'(-6,2) 2- X’ (2,6) Y’ (-3,1) 3- X’ (-2,-6) Y’ (3,-1) 4- X’ (6,-1) Y’ (1,3)

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