Answer:
71. [tex]\left[\begin{array}{ccc}-1&0\\-1&7\end{array}\right] \\[/tex]
72. cannot be combined because the dimensions are not the same
73.[tex]\left[\begin{array}{ccc}-4&6&2\\-2&0&8\end{array}\right][/tex]
74.-2
Step-by-step explanation:
71.[tex]\left[\begin{array}{ccc}3-4&1-1\\5-6&7-0\end{array}\right][/tex]=[tex]\left[\begin{array}{ccc}-1&0\\-1&7\end{array}\right] \\[/tex]
72.Since B is 2x2 and C is 3x2
73.[tex]\left[\begin{array}{ccc}2*-2&2*3&2*1\\2*-1&2*0&2*4\end{array}\right] \\[/tex]
74.[tex]\left[\begin{array}{ccc}-2&3&4\\0&|-2|&1\\3&4&-1\end{array}\right][/tex]The answer is -2 because the value at row 2 column 2 is -2
