AM-1105

Exponential and logarithmic models

A Math · Secondary 4 · Medium · Exponential and logarithmic models

The value

S

of a machine (in dollars) is given by

S = 5000 + 12000e^{-0.25t}

, where

t

is the time in years after purchase. Find

t

when the value of the machine is

\$8000

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