Forrest lumber uses the function

s(t) = -90t + 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?

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.