Is this a square matrix? Why or why not? 
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Q15: Use a graphing calculator to solve
Q16: Use the echelon method to solve
Q17: Can non-square matrices have inverses? Why or
Q18: Use the Gauss-Jordan method to solve
Q19: Use the Gauss-Jordan method to solve
Q21: Find the matrix product, if possible.
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Q22: Solve the problem.
-A company makes three
Q23: Solve the problem.
-A basketball fieldhouse seats 15,000.
Q24: Decide whether the matrices are inverses
Q25: Find the matrix product, if possible.
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