A high school music department buys a piano for $⁢3,000 It is expected to have a salvage value of $⁢500 after 10 years. What equation represents its straight-line depreciation?

Straight-line depreciation subtracts the same amount of value each year. The piano depreciates by ($3,000 − $500) ÷ 10 = $250 per year, so its value after t years is D(t) = 3,000 − 250t. This is choice D.

AI-written and checked against the verified answer.