Evaluate 
where S is the closed surface of the solid bounded by the graphs of 
and 
. 
Definitions:
Stock Investment
Stock investment involves purchasing shares of a company's stock in expectation of earning a return from dividends or capital appreciation.
Debt Investments
Financial assets involving funds lent to an entity (corporate or governmental) that promises to return the principal along with interest on a specified timeline.
Face Value
The nominal value stated on a financial instrument, such as a bond or stock certificate.
Brokerage Fees
Charges levied by a broker for facilitating transactions between buyers and sellers.
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