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 Challenge
 Exponential:  A number written with an exponent. For example, 6,3 is called an exponential.

The Last Digit: Given a number raised to a large power, find the one's digit of the expansion.

Want to Be a Millionaire?: If a bank doubles your money, how long will it take you to become a millionaire?

Negative Exponents: Explore the relationship between positive and negative exponents.