Question

Plz help a girl out!

Answer 1

71.
`\left[\begin{array}{ccc}-1&0\\-1&7\end{array}\right] \\`

72. cannot be combined because the dimensions are not the same

73.
`\left[\begin{array}{ccc}-4&6&2\\-2&0&8\end{array}\right]`

74.-2

Explanation:

71.
`\left[\begin{array}{ccc}3-4&1-1\\5-6&7-0\end{array}\right]`=
`\left[\begin{array}{ccc}-1&0\\-1&7\end{array}\right] \\`

72.Since B is 2x2 and C is 3x2

73.
`\left[\begin{array}{ccc}2*-2&2*3&2*1\\2*-1&2*0&2*4\end{array}\right] \\`

74.
`\left[\begin{array}{ccc}-2&3&4\\0&|-2|&1\\3&4&-1\end{array}\right]`The answer is -2 because the value at row 2 column 2 is -2