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

7-15.

For parts (a) and (b), find a recursive equation in *a _{n}* form for each sequence. (For a reminder about

*a*form see the Math Notes box in Lesson 5.3.2.) For parts (c) and (d) find an explicit equation for each sequence.

_{n}**Homework Help ✎**

*a*_{1}= 108*a**a*_{n}_{+1}= a+12_{n}

, , , … *a*_{(}_{n}_{ + 1)}= 2*a*_{n}

Is the sequence arithmetic or geometric?

Is the sequence arithmetic or geometric?