The club uses the function S(t) = -4,500t + 54,000 to determine the salvage S(t) of a fertilizer ble

The club uses the function S(t) = -4,500t + 54,000 to determine the salvage S(t) of a fertilizer blender t years after its purchase. How long will it take the blender to depreciate completely?

Complete depreciation means the salvage value is 0.

So S(t) = 0. We need to find t to make S(t) = 0

-4,500t + 54,000 = 0

Subtract 54,000 from each side
-4,500t = -54,000

Divide each side by -4,500
t = 12