Exhibit 11.21
The following questions use the data below.
A store wants to predict quarterly sales. The owner has collected 3 years of sales data and wants your help in analyzing the data. He wants to use Winter's method to forecast sales. 
-Refer to Exhibit 11.21. What formulas should go in cells E3:H16?
Definitions:
Free Nitrogen
Atmospheric nitrogen (N2) that is not bound in compounds and is inert due to its strong triple bond, making it unavailable to most organisms unless fixed.
Parasitic Flatworms
Flattened worms that live at the expense of other organisms, causing them harm.
Sandier Soil
Soil with a high proportion of sand particles, known for good drainage and low nutrient retention.
Nudibranchs
Colorful, soft-bodied sea slugs known for their striking appearances and complex behaviors.
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