i read my text book stuck on this hw problem. can someone explain simple?

Chapter 8 Quiz(0 (2) EO T Table Chart Text Shape Media 125% Zoom Comment Collaborate Insert Add Category Sheet1 D Marlow Company purchased equipment on January 1, 2019 for $70,000. It is estimated that the equipment will have a $5,000 salvage value at the end of its 5-year useful life. It is also estimated that the equipment will produce 100,000 units over its 5-year useful life. a Compute the amount of depreciation expense for the years ended December 31, 2019 and December 31, 2020 using the following 3 methods: Straight-line Units of activity: 16,000 units produced in 2019 and 24,000 units produced in 2020. Double declining balance b a Straight-line b Units of activity