Here are the definitions matched with their corresponding key words:
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Exponential function: A function that has the form f(x) = a • b^x, where the coefficient a is a constant, the base b is positive but not equal to 1, and the exponent x is any number.
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Exponential growth: A situation in which a quantity increases by a common ratio at regular intervals.
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Exponential decay: A situation in which a quantity decreases by a common ratio at regular intervals.
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Compound interest: Interest calculated on both the principal and any previously earned interest.
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Principal: The amount of money invested or borrowed.