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SAT Functions as Models

If the current through a conductor decreases exponentially with time according to the equation I(t)=I0(54)t,I(t)=I_{0}\left(\frac{5}{4}\right)^{-t}, where I0=64I_{0}=64 mA is the initial current, how many seconds after t=0t=0 will the current be approximately 2626 mA?

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

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