Polonium-210 has a half-life of 140 days. Suppose a sample of this substance has a mass of 300 mg. (a) Find a function that models the amount of the sample remaining at time t. (b) Find the mass remaining after one year. (c) How long will it take for the sample to decay to a mass of 200 mg? (d) Draw a graph of the sample mass as a function of time.

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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.