• exponential refers to exponents.
• noun: exponent, adjective: exponential, adverb: exponentially.
• In an exponential, the base remains the same,
the exponent is a variable.
An exponent is a small number placed to the upper-right of a base number
showing how many copies of the base number are multiplied together.
• exponential sequences can increase (grow)
or decrease (decay) very quickly.
growth ~ positive exponents,
decay ~ negative exponents.