Scalar Multiplication of a Matrix

Q. If $A=\left[\begin{array}{cc}0& 2\\ 3& -4\end{array}\right]$ and $kA=\left[\begin{array}{cc}0& 3a\\ 2b& 24\end{array}\right]$, then the values of k, a, b are respectively.

1. -6, -12, -18
2. -6, 4, 9
3. -6, 12, 18
4. -6, -4, -9

Q. $\left(\begin{array}{c}\frac{-6}{5}÷\frac{8}{9}\end{array}\right)÷\frac{7}{10}\ne \frac{-6}{5}÷\left(\begin{array}{c}\frac{8}{9}÷\frac{7}{10}\end{array}\right)$
If true then enter $1$ and if false then enter $0$

Q.

$A=\left[\begin{array}{ccc}5& 7& 2\\ 4& -1& 3\\ 6& 8& -5\end{array}\right]$ and $B=\left[\begin{array}{ccc}6& 11& -4\\ 2& 1& -5\\ 3& -9& 6\end{array}\right]$ Match each value to the correct entry in matrix $AB$.

$AB=\left[\begin{array}{ccc}{x}_{11}& x_{12}& x_{13}\\ x_{21}& x_{22}& x_{23}\\ x_{31}& x_{32}& x_{33}\end{array}\right]$

Column 1	Column 2
$x_{11}$	$37$
$x_{12}$	$31$
$x_{13}$	$-94$
$x_{21}$	$44$
$x_{22}$	$119$
$x_{23}$	$7$
$x_{31}$	$50$
$x_{32}$	$16$
$x_{33}$	$-43$

Q. Adj $\left[\begin{array}{ccc}1& 0& 2\\ -1& 1& -2\\ 0& 2& 1\end{array}\right]=\left[\begin{array}{ccc}5& a& -2\\ 1& 1& 0\\ -2& -2& b\end{array}\right]\Rightarrow [a,b]=?$

1. $[-4,-1]$
2. $[-4,1]$
3. $[4,1]$
4. $[4,-1]$

Q. $\left|\begin{array}{ccc}a+b& a& b\\ a& a+c& c\\ b& c& b+c\end{array}\right|$ is equal to.

1. $abc$
2. $4abc$
3. $4a^{2}bc$
4. $a^2{b}^2{c}^2$

Q.

If A = $\left[\begin{array}{ccc}1& 4& 5\\ 3& 2& 6\end{array}\right]$ then second element of second row of 3A =

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