Why would you use cell names in formulas instead of numbers? it is easier to remember cell names. it is faster to type. the spreadsheet does not understand numbers. calculations in spreadsheets are instantly updated if one of the entries is changed.

Well, it is definitely easier to remember cell names opposed to their formulas, however, "calculations in spreadsheets are instantly updated if one of the entries is changed" is true. Though it is a setting in Excel which you can change, it is the automatic setting for spreadsheets. So, your answer is "Calculations in spreadsheets are instantly updated if one of the entries is changed" I believe.