1. The document discusses different depreciation methods including straight line, diminishing balance, and fixed installment methods. It provides examples of machinery accounts showing the calculation of depreciation expense and accumulated depreciation over multiple years for different companies and assets. 2. Multiple problems are presented involving the purchase and sale of machinery, with depreciation calculated annually at rates such as 10% or 15% on the original cost or diminishing balances. The accounts show the decreasing value of the assets over time. 3. Solutions to the problems would include machinery accounts displaying the cost of the assets, annual depreciation expense, accumulated depreciation, and eventual sale of the assets.