It is a matrix or a determinant.
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I asked the same darn thing when I was in 3rd grade.An array is a arrangement of objects in rows and columns!!!
57
columns. lines.
A good arrengenent would be ,Three rows of three. Or 3*3=9 cubic units.
Rows are always horizontal, and columns are vertical. It's easier to remember when you think of rows of seats (like in a sports stadium) which are horizontal, and buildings have tall columns, which are vertical.