please help with 4,5, and 6

Exercise 4. Expect Company purchases a factory machine at a cost of $18,000 on January 1, 201. Expect Company thinks the machine will help the company earn revenue for 160,000 hours over a 4 year period and then be sold for $2,000 (residual value). During the first 4 years, the machine was used 40,000,60,000,35,000, and 30,000 hours respectively. Complete the following grid as to the amount that would be depreciated (expensed) over the 4 years the machine was used to help the company earn revenue by the 3 methods studied. Exercise 5. The Keith Company purchased a new machine on October 1,201 for $110,000. The company paid $10,000 in freight charges to ship and install the new machine in their factory. The company estimates that it will use the machine for 10,000 hours over the next 5 years and then be able to sell it for $15,000 ( Residual Value ). Compute the amount of cost to be debited to Depreciation Expense and credited the Accumulated Depreciation account under the following methods for the years indicated. Straight-line for 201. Units-of-Activity for 201, assuming the machine was used for 1,700 hours. Declining-balance using double the straight-line persentage (DDB) for 201 and 202. Exercise 6. Jerry Page, the new Controller for the Burnblack Company, has reviewed the expected useful depreciated by the straight-line method and the company uses a calendar year in preparing their annual Financial Statements. After discussion, management has agreed to accept Jerry's following proposaled changes. Compute and show computations for the revised annual depreciation for 201 on each asset. Show the year end Adjusted Journal Entry for the Building. a) Building b) Warehouse Ajdusting Journal Entry for the Building