Chapter 13 was the last chapter we have learned in class. We just took a VERY hard chapter test on it before the weekend. It was all about sequences, series, and sigmas. The formulas must be memorized just like any other type of math problem in order to do well. I was going to do this blog on 13-6 with the sigmas but I can’t figure out how to get a picture of a sigma on here, so I’ll do 13-1. 13-1 was pretty simple because you needed to know arithmetic and geometric sequences.
Aritmetic- when a number is added or subtracted repeatedly
Geometric- when a number is multiplied or divided repeatedly
Ex. 2, 7, 12, 17, 22… is an arithmetic sequence because 5 was added each time
1, 3, 9, 27… is geometric because 3 was multiplied to each number
There are formulas for both as well, tn = t1 + (n-1) (d) – arithmetic
tn = t1 x (r) ^ n-1 – geometric
Those formulas are used for different things such as finding which number would come later on in a series and different things like that.
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