Daily Hoagie Sales
The table below shows the number of hoagies sold daily during a four-week period at Hoagie Haven in Sutton,West Virginia. 
-{Daily Hoagie Sales Narrative} Use regression analysis to find the linear trend line.
Definitions:
Interest-Rate Cost-Of-Funds
The expense related to borrowing funds, calculated based on the interest rate charged by lenders over the period of the loan.
Retained Earnings
Profits that a company keeps, after dividends have been paid, for reinvestment in the business or to pay off debt.
Marginal Cost
The additional cost incurred by producing one more unit of a good or service, a crucial concept in economic decision-making.
R&D Financing
The allocation of financial resources towards research and development activities within a company or institution, aiming to innovate or improve products or technologies.
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