tori's

this week, we learned chapter 13 section 1.
it was extremely easy in my opinion!

Sequences-a list of numbers

arithmetic- when you add/subtract the same number to every term
geometric- when you multiply/divide the same number for every term

ex. 1
are the following sequences arithmetic, geometric, or neither?

a. 4, 8, 12, 16,...------> arithmetic +4
b. 9, 27/2, 81/4,...----> geometric x3/2

to find the nth term of a sequence

FORMULAS:
arithmetic- tsubn=tsub1+(n-1)d
geometric- tsubn=tsub1xr^(n-1)

where d is what is being added or subtracted and r is what you are multiplying or dividing by.

example 2:
if tsubnl=4n-3, find the first 4 terms:

tsub1=4(1)-3=4-3=1
tsub2=4(2)-3=8-3=5
tsub3=4(3)-3=12-3=9
tsub4=4(4)-3=16-3=12
arithmetic +4

and there we gooo!