Find the average value of the given function
f(x, y)
over the plane region R. 
; R is the region bounded by the graph of y = 6x and y = 0 from x = 1 to x = 5.
Definitions:
Adjustment Columns
Special columns found in accounting ledgers and worksheets used for making necessary modifications to accounts at the end of a reporting period.
Depreciation Expense
The cost allocated over the useful life of a tangible asset to account for its decline in value due to use and time.
Accumulated Depreciation
The total depreciation for a fixed asset that has been charged to expense since the asset was acquired and available for use.
Adjusting Entry
A journal entry made at the end of an accounting period to update account balances to reflect accurate and fair financial statements.
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