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Scientific notation is a way to write very large or very small numbers using exponents. For example 2000 is 2x103 . We can do the same thing with negative exponents and write very small numbers like 1/2000 which is 2x10-3 . So one real life use of exponents in in scientific notation.
Fortunately there are websites dedicated to mathematics that provide guides and tips. The website LearnZillion provides a video tutorial on how to use whole number exponents to denote powers.
You can use any number - rational or otherwise - as an exponent.
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Numbers expressed using exponents are called powers. When writing a number expressed as an exponent, the number is called the base.