What row operation would produce zero beneath the first entry in the diagonal? 
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Q72: Perform the indicated operation(s), if possible. Do
Q73: Perform the indicated operation, if possible. Do
Q74: Solve the system by triangularizing the augmented
Q75: Perform the indicated row operations, then write
Q76: Solve the system by triangularizing the augmented
Q78: Solve the system by triangularizing the augmented
Q79: Perform the indicated operation, if possible. Do
Q80: Solve the system by triangularizing the augmented
Q81: Find the inverse of the 2 *
Q82: Find the area of the triangle with
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