A radioactive substance has a half-life of one week. In other words, at the end of every week the level of radioactivity is half of its value at the beginning of the week. The initial level of radioactivity is 20 counts per second.  a) The function that models the radioactivity remaining at the end of each week is   . (Enter your equation without spaces, with parentheses around the b value, and using a caret for the exponent, such as y=3(1.25)^t .)

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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.