Karen purchased a used vehicle that depreciates under a straight line method the initial value if the car is 4400 and the salvage value is 800 if the car is expected to have a useful life of another six years how much will it depreciate each year

It is expected to depreciate from 4400 to 800 in 6 years. The depreciation per year is the ratio
  depreciation per year = (total depreciation) / (number of years)

The total depreciation is the change in value, so the depreciation per year is
  (4400 - 800)/6 = 600

Karen expects the vehicle to depreciate by 600 each year.