Find the area of the region under the graph of 
from x = 1 to x = 2.
Definitions:
Weekly Cash Flows
The movement of cash in and out of a business on a weekly basis, tracking how money is spent and received.
Opportunity Cost
The expense incurred by not choosing the second-best option while deciding.
Monthly Cash Flows
The total amount of money being transferred into and out of a business, particularly during a month.
Lockbox System
A system used by companies to expedite the collection of check payments by having them processed through a bank's PO Box.
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