A high school's photography club purchases a new camera for $⁢800 The camera has an expected useful life of 5 years and a salvage value of $⁢100 Which equation represents the straight-line depreciation of the camera?

Straight-line depreciation reduces the camera’s value by the same amount each year. The total depreciation is $800 − $100 = $700 over 5 years, so the yearly decrease is $700 ÷ 5 = $140. Starting at $800, the value after t years is D(t) = −140t + 800, which is choice D.

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