Hamsmith uses straight-line depreciation for buildings andequipment and its fiscal year end is December 31. The buildings areestimated to have a 50-year useful life and no residual value; theequipm Hamsmith uses straight-line depreciation for buildings and equipment and its fiscal year end is December 31. The buildings are estimated to have a 50 -vear useful life and no residual vahe; the equipm 0 answers