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Differentiating e gives you e again. But there is a chain '-0.3t' to be differentiated.
Date Posted:
5 years ago
(a) is simply solving an exponential equation for t.
(c) is setting t to a large number so e to the power of -0.3t is a very tiny number.
(c) is setting t to a large number so e to the power of -0.3t is a very tiny number.