Matrix Addition Quiz

What is the value of the {ij}th element of Matrix D if:

D=A+B-C

a. i=2, j=3

b. i=3, j=1

A=\begin{bmatrix} 3 &0.6 &4&-3\\ -1.3 &4 &0&8.6\\7&0 &-8& 0.006\end{bmatrix}

B=\begin{bmatrix} 3 &-5.76 &45&0\\ 2 &-2 &1.3&9\\-9&0 &0& 0\end{bmatrix}

C=\begin{bmatrix} 0 &1009 &-66.7849&90\\ 0 &5 &4&-0.07\\-7.7&0 &0& 0\end{bmatrix}

Remember: if you are having issues with the workspace, reset your data.