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Arithmetic Sequences
Geometric Sequences
100
What is the formula for an Arithmetic Sequence?
a
n
= a
1
+ (n - 1)d
100
What is the formula for a geometric series? What are the first four terms of the following sequence? Tn=3*(-1/3)^n-1
a
n
= a
1
r
n-1
3, -1, (1/3), (-1/9)
200
Write an explicit formula for the following sequence:
-24, -20, -16, ...
T
n
=4n-28
200
Write a recursive formula for the following sequence: 8, -4, 2, -1, ...
T1=8 Tn=(-1/2)*Tn-1
300
What are the first four terms of the following sequence?
T
1
=12
T
n
=T
n-1
+ (-23)
12, -11, -34, -57
300
What is the 17th term of the following sequence? 65, 45.5, 31.85, 22.295, ...
0.22
400
What is the equation to find the 89
th
term of this sequence?
3, 15, 75, 375
3*5
89-1