Level:
Project ID:
2000019301
Accepted:
0
Clonable:
0
Easy:
0
Three ice cream stands of ICE company reported their July sales of four ice cream flavors in number of portions sold. All data can be seen in the table below.
\[ \begin{array}{|c|c|c|c|c|} \hline &\text{vanilla} & \text{chocolate} & \text{nut} & \text{strawberry} \\\hline
\text{Stand 1}& 720 & 800 & 1\,200&360 \\\hline
\text{Stand 2} & 550 & 434 & 900 & 300 \\\hline
\text{Stand 3} &610 &300 & 200 & 750 \\\hline \end{array}\]
The data provided by the stands for August sales are reported in the matrix \(A\).
\[ A=
\left (\array{
650& 470 & 890 & 410\cr
500& 505 & 890 & 300\cr
380& 520 & 350 & 800\cr } \right )
\]
If the July sales are rewritten to the matrix \(J\), by what matrix the sales of ice cream for both summer months are described?
matrix \(J+A\)
matrix \(J-A\)
matrix \(J \cdot A\)
matrix \(2J+2A\)