The details vary, depending on the calculator. To specify, for example, 5 to the power -2, you might typically press the following keys:
5 (xy) 2 (+/-)
To specifically 10 to a positive or negative power, use the antilog function; for example, for 10 to the power -6:
6 (+/-) (10x)
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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.
What you do with them is this i am going to give you an example: if you had 2 with the exponet 4 this is what you do: 2x2x2x2 and that would equal 8
Same place as the minus sign
By using a calculator:)