Use the definition of a logarithm to prove 
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Definitions:
Compounded Semiannually
The process of computing interest twice yearly and adding it to the principal sum, affecting the total amount earned or paid.
Residential Mortgage Loan
A loan secured by real property, typically a residential property, where the borrower is obliged to pay back with a predetermined set of payments.
Promissory Note
A written, legally binding promise to pay a specified sum of money to a designated person at a specified date or upon demand.
Compounded Semiannually
Interest calculation method that applies the interest to the principal balance and the accumulated interest twice each year.
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