C(4)-C(0) 4 AC(t) 4 The energy in a rechargeable battery is changing with respect to time, such that the energy is given by C(t), where C(t) is measured in Coulombs and t is measured in seconds. A line is shown for C(t) at t = 4 seconds. Determine the best estimate for the value of the instantaneous rate of change for C(t) when t = 4. OC(4.2)-C(3.8) 0.4 C(limt) 1-4 8 7 6 5 4 3 2 1 0 -1 C(t) 0 6 7 8

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