A thread was folded in half twice. Then, it was cut in a random place. One of the pieces is 8cm, and the longest piece is 18cm.
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In the expression given, the "n" is referring to a certain term, in this case, it would be the 16th term. So in order to find the 16th term, all you have to do is substitute n as 16 in the expression, so the answer is 
. So the 16th term of the sequence is -29.