A high school science club buys a telescope for $1,500 with an expected useful life of 5 years and a salvage value of $300 What equation represents the straight-line depreciation of the telescope?

The telescope loses its purchase price minus its salvage value over its useful life: $1,500 − $300 = $1,200. Dividing $1,200 by 5 years gives annual depreciation of $240, so its value after t years is D(t) = 1,500 − 240t. This is choice A.

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