A school's sports team acquires gym equipment for $2,500 , with an expected salvage value of $500 after 5 years. Which equation correctly represents the straight-line depreciation?

Straight-line depreciation reduces the equipment’s value by the same amount each year. The yearly depreciation is (2,500 − 500) ÷ 5 = 400 dollars, so its value after t years is D(t) = 2,500 − 400t. This matches choice A, and after 5 years the equation gives the $500 salvage value.

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