### Home > CCA > Chapter 7 > Lesson 7.1.1 > Problem7-15

7-15.

For parts (a) and (b), find a recursive equation in an form for each sequence. (For a reminder about an 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. $108,120,132,\dots$

a1 = 108a
an+1 = an+12

1. $\frac { 2 } { 5 }$,$\frac { 4 } { 5 }$,$\frac { 8 } { 5 }$, …

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

a(n + 1) = 2an

1. $3741,3702,3663,\dots$

Is the sequence arithmetic or geometric?

1. $117,23.4,4.68,\dots$

Is the sequence arithmetic or geometric?