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  Clarissa used a 2 x 2 matrix to represent the number of books needed for each
  semester for the two courses she is taking this year at Mississippi State University.
  S1 is the matrix for the first semester, and S2 is the matrix for the second semester. Which matrix represents the total number of textbooks and workbooks needed for
  the whole year?

  
  

  

  

  

  

  
  
  

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  What values of x, y, z, and w make this matrix equation true?

  
  

  x = 1, y = -5, z = 9, w = 4

  x = 1, y = -5, z = 9, w = -4

  x = 1, y = -1, z = 9, w = -4

  x = 1, y = -5, z = 5, w = -4

  
  
  

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