Final answer:
Select the range A1:G1 on a spreadsheet labeled '2010 Sales' and use the 'Merge & Center' feature to combine and center the cells.
Step-by-step explanation:
The question relates to using spreadsheet software, which typically falls under the Computers and Technology category. To merge and center the content in the top row from column A to G, you would first select the range A1:G1. Then, you can use the "Merge & Center" feature commonly found in the toolbar or ribbon of the spreadsheet application. This action combines the individual cells into one large cell and centers the content within it. This is commonly done to create a title or heading that spans across multiple columns for better visual presentation in a worksheet labeled as '2010 Sales'.