The method of least squares was used to develop a cost equation to predict the cost of monthly equipment maintenance.The following computer output was received: 
What is the independent variable of the cost formula for equipment maintenance?
Definitions:
Dependability
The quality of being trustworthy and reliable, often used to describe products, services, or sources of information.
Total Logistics Cost
The cumulative expenses associated with planning, implementing, and controlling the efficient flow and storage of goods, services, and related information from point of origin to point of consumption.
Materials Handling
The movement, protection, storage, and control of materials and products throughout manufacturing, warehousing, distribution, consumption, and disposal.
Order Processing
The series of actions or steps taken by a business to fulfill and ship orders to customers.
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