3. Forrest Lumber uses the function
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?
11 years
9 years
7 years
10 years

Question

3. Forrest Lumber uses the function
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?
11 years
9 years
7 years
10 years

anonymous · Answer

Plug in the years for t and you will get a depreciation value. Since t is the years you plug in the number of years for t. So 11 years will be -240 (-1320+1080) and 9 years will be 0 (-1080+1080), 7 years will be 240 (-840+1080), and 10 years will be -120 (-1,200+1080)