Find an equation for the tangent plane to 
at 
.
Definitions:
Cash Balance
The amount of money on hand or in bank accounts, immediately available to a business or individual.
Money Paid Out
The total amount of money a company or individual spends or disburses.
Average Collection Period
The average number of days it takes for a company to receive payment after a sale has been made on credit.
Accounts Receivables
Money owed to a business by its customers for goods or services that have been delivered or used but not yet paid for.
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