SAT Functions as Models

Algebra Level 2

If the current through a conductor decreases exponentially with time according to the equation \(I(t)=I_{0}\left(\frac{5}{4}\right)^{-t},\) where \(I_{0}=64\) mA is the initial current, how many seconds after \(t=0\) will the current be approximately \(26\) mA?

(A) One
(B) Two
(C) Three
(D) Four
(E) Five

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