### Home > CC4 > Chapter 7 > Lesson 7.1.4 > Problem 7-48

7-48.

For parts (a) and (b), write a recursive equation using

*a*notation for each sequence. For parts (c) and (d), write an explicit equation using_{n}*t*(*n*) notation for each sequence. (For a reminder about sequence notation, see the Math Notes box in Lesson 5.3.2.) Homework Help ✎108, 120, 132, …

, , , … 3741, 3702, 3663, …

117, 23.4, 4.68, …

Read Math Notes box in Lesson 5.3.3 on equations for sequences.

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

_{+1}=

*a*+12

_{n}*a*_{(}_{n}_{ + 1)} = 2*a _{n}*

Is the sequence arithmetic or geometric?

Remember to write an explicit equation.

Is the sequence arithmetic or geometric?

Remember to write an explicit equation.