The mass of a radioactive substance follows a continuous exponential decay model. A sample of this radioactive substance has an initial mass of 8.197 kg and decreases continuously at a relative rate of 16% per day. Find the mass of the sample after four days. Write the exponential function for this situation. Do not round any intermediate computations, and round your answer to the nearest tenth.

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.