Dexter industries purchased packaging equipment on january 8 for $72,000. the equipment was expected to have a useful life of three years, or 18,000 operating hours, and a residual value of $3,600. the equipment was used for 7,200 hours during year 1, 5,400 hours in year 2, and 5,400 hours in year 3. required: 1. determine the amount of depreciation expense for the three years ending december 31, by (a) the straight-line method, (b) the units-of-activity method, and (c) the double-declining-balance method. also determine the total depreciation expense for the three years by each method. round the final answers for each year to the nearest whole dollar.1) find the force transmitted by the coupling between the nozzle and hose. 2) indicate whether the coupling is in tension or compression. 3) find the velocity of water flowing through the hose.