CPM Homework Help : CCA Problem 7-15

For parts (a) and (b), find a recursive equation in a_n form for each sequence. (For a reminder about a_n form see the Math Notes box in Lesson 5.3.2.) For parts (c) and (d) find an explicit equation for each sequence. Homework Help ✎
1. 108, 120, 132, …
2. ,,, …
3. 3741, 3702, 3663, …
4. 117, 23.4, 4.68, …

Answer (a):

a₁ = 108a
a_n₊₁ = a_n+12

Answer (b):

$a_1=\frac{2}{5}$

a₍_n_{+ 1)} = 2a_n

Hint (c):

Is the sequence arithmetic or geometric?

Hint (d):

Is the sequence arithmetic or geometric?