no button you gotta work it out yaself
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the via button means the variable.
There should be a negative button on your calculator, separate from the minus button. Press that button before pressing the buttons for the numbers of the exponent.
the pi button always located on the top of 'EXP' button.
On my CASIO fx-115MS it is the "log" button you need to press the "shift" button then press log and a small "10" will appear on your calculator screen. Hope this helps...
You press the SHIFT button and then you press the x10 button.