A growth factor helps you calculate a final amount after a percentage has been added or subtracted. It is given by the formula:

 is the decimal representation of the percentage that is being added or subtracted.

A decay factor helps you calculate a final amount after a percentage has been subtracted. It is given by the formula:

 is the decimal representation of the percentage that is being subtracted.

The number in front of a variable or product of variables, showing how many you have of that variable or product of variables

A symbol, often a letter from the alphabet, which represents an unknown value.

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