For the following exercises, perform the requested operations on the given matrices.
A=\left[\begin{array}{rr}
4 & -2 \\
1 & 3
\end{array}\right], B=\left[\begin{array}{rrr}
6 & 7 & -3 \\
11 & -2 & 4
\end{array}\right], C=\left[\begin{array}{cc}
6 & 7 \\
11 & -2 \\
14 & 0
\end{array}\right], D=\left[\begin{array}{rrr}
1 & -4 & 9 \\
10 & 5 & -7 \\
2 & 8 & 5
\end{array}\right], E=\left[\begin{array}{rrr}
7 & -14 & 3 \\
2 & -1 & 3 \\
0 & 1 & 9
\end{array}\right]
39. -4 A
40. 10 D-6 E
41 . B+C
42. A B
43. B A
44. B C
45. C B
46. D E
47. E D
48. E C
49. C E
50. A^{3}