MS Excel
To activate the previous cell in a pre-selected range, press

The Alt key
None of these
The Tab key
The Enter key

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MS Excel
Rounding errors can occur

Because excel uses hidden decimal places in computation
When you use multiplication, division, or exponentiation in a formula
When you show the results of formulas with different decimal places that the calculated results
When you use addition and subtraction in a formula

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MS Excel
You can edit a cell by

None of these
Selecting Edit > Edit cell from the menu
Clicking the formula button
Double clicking the cell to edit it in place

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