Quarterly billing for water usage is shown below. 
a.Solve for the forecast equation that minimizes the sum of squared error.
b.Forecast the summer of Year 5 and spring of Year 6.
Definitions:
Ending Inventory
The value of goods available for sale at the end of an accounting period which is not yet sold.
Inventory Turnover
A ratio showing how many times a company's inventory is sold and replaced over a specific period, indicating efficiency in inventory management.
Days' Sales
A metric that calculates the average time it takes for a company to convert its inventory into sales.
Average Daily Cost
This measures the average amount spent per day over a specified period, often used in budgeting and financial planning.
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