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OpenStudy (anonymous):
Forrest Lumber uses the function S(t) = -135t + 810 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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OpenStudy (anonymous):
0= -135t +810 135t = 810 t=810/135 =6 years
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