Hi Ingrid,

I'd be happy to help you understand the difference between "merge and center" and "merge across" in Excel 2007.

"Merge and center" is a command that combines multiple cells into one cell and centers the text horizontally within the new merged cell. This is useful when you want to create a title or heading for a table, for example. Here's how to use it:

1. Select the cells you want to merge.
2. Click the "Merge and Center" button in the Alignment group on the Home tab.
3. The selected cells will now be merged into one cell and the text will be centered horizontally within the new merged cell.

"Merge across" is a similar command, but it only merges the selected cells horizontally, without centering the text. This is useful when you want to merge cells in a row without affecting the alignment of the text. Here's how to use it:

1. Select the cells you want to merge.
2. Click the "Merge Across" button in the Alignment group on the Home tab.
3. The selected cells will now be merged horizontally into one cell, but the text will retain its original alignment.

I hope this helps you understand the difference between these two commands. Let me know if you have any other questions!