S (t) = - 120t + 1,080 to determine the salvage value, S (t), in dollars, of a table saw t years after its purchase. How long will it take the saw to depreciate completely?

Question

Mathematics

Matilda

8 September, 13:05

S (t) = - 120t + 1,080 to determine the salvage value, S (t), in dollars, of a table saw t years after its purchase. How long will it take the saw to depreciate completely?

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Ximena Shah · Answer 1

In order for S (t) to equal to 0, it would take 9 years. If you multiply 9 times the - 120, you will get - 1080, then you add that to the + 1,080 and the answer is 0.