A laptop is purchased for $⁢1,200 and is expected to depreciate to $⁢200 over a period of 4 years. What is the equation for its straight-line depreciation?

The laptop loses $1,200 − $200 = $1,000 in value over 4 years, so it depreciates by $1,000 ÷ 4 = $250 per year. Starting at $1,200, its value is D(t) = 1,200 − 250t. This matches the choice stating D(t) = 1,200 − 250t.

AI-written and checked against the verified answer.