Forrest Lumber uses the function

S(t) = -135t + 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?
10 years
6 years
7 years
8 years
@Secret-Ninja

Question

Forrest Lumber uses the function 

S(t) = -135t + 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?
10 years
6 years
7 years
8 years
@Secret-Ninja

zepdrix · Answer

`How long will it take the saw to depreciate completely?`
So they want to know when the Salvage value will be zero.

zepdrix · Answer

$$\Large\rm S(t) = -135t + 1,080$$$$\Large\rm 0 ~~\quad= -135t + 1,080$$And solve for t.

swaqqout_kid1 · Answer

@SolomonZelman