Determine the largest set on which the function is continuous. 
Definitions:
Cash Paid
The total amount of cash outlay by a company during a specific period for expenses, acquisitions, or investments.
Semiannual Interest
The payment of interest on a loan or bond twice a year.
Bond Interest Expense
The cost incurred by an issuer of bonds for the interest payments made to bondholders.
Cash
Liquid assets held by a company or person, used for transactions or as a store of value.
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