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?

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?