A scientific calculator should have several related keys: a power key, often labeled something like xy or yx, to calculate powers; two antilogarithm keys (10x and ex), which often require you to press some sort of "shift" key first; and a key to type numbers in scientific notation - sometimes labeled something like "EXP". To use the latter key, type the mantissa, press the key, then type the exponent.
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The exponent key on a calculator is typically denoted by a symbol like "^" or "y^x". It is used to raise a number to a certain power. For example, if you wanted to calculate 2 raised to the power of 3, you would press the exponent key and enter the numbers accordingly.
negative 4 with negative 3 as an exponent
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Calculator.
To write an exponent on a laptop you would use the "^" key. For example, "3^2" would be "three squared."
If you don't have a calulator with the percent key, then use a decimal number. Example being 4% would then be .04, or 10% would be .10.