Fill in the letter of the word that best fits in each sentence. Use each letter only once. 
Definitions:
Simple Interest
A method of calculating the interest charge on a loan or financial investment based on the initial principal and a fixed interest rate over time.
Interest Rate
The proportion, typically expressed as a percentage, at which interest is charged on a loan or paid on savings.
Like Terms
Terms that have the same variables raised to the same power, which can be combined by adding or subtracting the coefficients.
Parentheses
Parentheses are symbols used in mathematics to group terms or to indicate the order of operations.
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