arithmetic
posted by judy .
List the terms that complete a possible pattern in each of the following and state whether the pattern is arithmetic, geometric, or neither:
(a) 38, 33, 28, 23, 18, …
(b) 640, 320, 160, 80, …
(e) 1, ___, ___, ___ 25, 36, 49

Study this site, and then post what you think the answers are.
http://www.mathsisfun.com/numberpatterns.html 
a)The pattern is continued by subtracting 5 each time.
b)The pattern is continued by dividing by 2 each time.
e)
1,4,9,16,25,36,49
In this series,all numbers are the squares of consecutive integers.
1^2=1
2^2=4
3^2=9
4^2=16
5^2=25
6^2=36
7^2=49